Browse Other O Word Lengths
16-Letter O Words by Ending Letter
All 361 16-Letter Words Starting With O
obdiplostemonous(botany, of flowers) Having two sets of stamens in alternating whorls, with the outer whorl opposite the petals.obhaplostemonous(botany) Having a single series of stamens equal in number to petals, but opposite with them.objectifiabilityThe quality of being objectifiable.objectificationsplural of objectificationobjectionabilityThe quality of being objectionable.obligatorizationSynonym of obligatorification.observationalismThe philosophical approach that derives knowledge from observations.observationalistOne who relies on empirical observations.observationalityThe property of being observational.obstreperousnessThe quality of being obstreperous.obstropulousness(UK, obsolete, slang) The quality of being obstropulous.obstructionisticRelating to, or supporting, obstructionism.occidentotropismAn expression (sometimes a figure of speech) with an inclination toward western civilization (i.e. the occident).occipitalisationConnection with the occipital boneoccipitalizationAlternative form of occipitalisation.occipitoanterior(anatomy) Having the occiput facing anteriorly or anterolaterally.occipitoatlantal(anatomy) Relating to the occiput and the atlas.occipitocervical(anatomy) Relating to the occiput and the neck.occipitocortical(anatomy) Relating to the occiput and the cerebral cortexoccipitoparietal(anatomy) Relating to the occipital and the parietal bonesoccipitoscapular(anatomy) Of or relating to the occiput and the scapula.occipitotemporal(anatomy) Of or pertaining to the occiput and temporal lobe.occipitothalamic(anatomy) Of or relating to the occiput and the thalamus.octacosadienoate(organic chemistry) Any salt or ester of an octacosadienoic acidoctadecadienoate(chemistry) Any salt or ester of octadecadienoic acid.octadecatrienoicOf or pertaining to octadecatrienoic acid or its derivatives; linolenic.octadecatrienoyl(organic chemistry, especially in combination) The univalent radical derived from octadecatrienoic acid by loss of the hydroxy group; linolenoyloctadepsipeptide(organic chemistry) An oligomeric form of depsipeptide composed of eight monomersoctoploidization(genetics) Modification to become octoploidoctosporoblasticHaving eight sporoblastsoctulofuranoside(organic chemistry) Any furanoside of an octulosonic acidoctulopyranoside(organic chemistry) Any pyranoside of an octulosonic acidoculomasticatoryInvolving eye movement and mastication; applied to a form of myorhythmia associated with Whipple's disease.oculorespiratory(pathology) That affects the eyes and the respiratory system.oculosympatheticRelating to the eye and the sympathetic nervous system.odontopaediatricRelating to odontopaediatricsodontopathogenicRelating to odontopathogensodontopediatricsAlternative form of odontopaediatrics.oesophagogastric(anatomy) Of or pertaining to the oesophagus and the stomach.oestrogenisationAlternative form of estrogenization.offensensitivityInappropriately high sensitivity to perceived offense.okuritsuriotoshi(sumo) A kimarite in which the attacker circles behind his opponent then lifts him up and slams him down.olfactogustatoryRelating to the senses of smell and tasteoligoadenylation(biochemistry) The formation of an oligoadenylateoligoamenorrhoea(medicine) Alternative spelling of oligoamenorrhea.oligoanovulationInfrequent or irregular anovulationoligoarabinosideAny oligomeric arabinosideoligoarthropathy(medicine) Arthropathy involving a limited number of joints.oligoastrocytoma(medicine) A form of brain tumor that is a mixture of oligodendroglioma and astrocytomaoligocrystallineHaving a few columnar grains parallel to its longitudinal axisoligocyclopropyl(organic chemistry) Describing a compound having a short chain of linked cyclopropane ringsoligodendogliomaMisspelling of oligodendroglioma.oligodendrimericRelating to oligodendrimersoligodendroblastA form of glial cell that is a precursor of an oligodendrocyteoligodendrocytesplural of oligodendrocyteoligodendrocyticRelating to oligodendrocytes.oligodendrogenicRelating to oligodendrogenesisoligodendroglialOf or pertaining to the oligodendrogliaoligodendroglion(anatomy) A glial cell smaller than an astrocyte, that forms the myelin sheath for many axonsoligodendropathy(pathology) Any disease that affects oligodendrocytesoligoelectrolyte(biochemistry) An oligomeric electrolyteoligofractionateTo divide into oligofractionsoligogalactoside(organic chemistry) An oligoglycoside of galactoseoligoheteromericoligomeric and heteromericoligohyaluronateAn oligomeric form of hyaluronateoligomannuronate(biochemistry) An oligomer composed of mannuronate monomersoligomenorrhagia(medicine) Infrequent but heavy menstrual flow.oligomenorrhoeicAlternative spelling of oligomenorrheic.oligomesotrophicIntermediate between oligotrophic and mesotrophicoligonitrophilic(biology) That needs relatively little nitrogen in order to achieve nitrogen fixationoligonucleosomalOf or pertaining to an oligonucleosomeoligonucleotidesplural of oligonucleotideoligonucleotidicRelating to an oligonucleotideoligoprogressionThe formation of several metastatic lesions from an initial tumouroligoprogressiveRelating to oligoprogressionoligosaccharidesplural of oligosaccharideoligosaccharidicRelating to oligosaccharides.oligosporogenousThat produces several sporesoligosymptomaticHaving few symptoms.oligotherapeuticRelating to oligotherapy.oligotrophicallyIn an oligotrophic manneroligouridylationThe addition of several uridine nucleotides to RNAoliodendrogliomaMisspelling of oligodendroglioma.oliogonucleotideMisspelling of oligonucleotide.omnipotentiality(chiefly psychology, uncountable) The characteristic or feeling that anything is possible, and there are no limits on what may be achieved; (countable, rare) an instance of this.omphaloarteritisarteritis of the umbilicusomphalophlebitis(pathology) inflammation of an umbilical veinoncohaematologicAlternative form of oncohematological.oncoinflammation(pathology) inflammation associated with a canceroncoinflammatoryRelating to, or causing oncoinflammationoncopharmacology(medicine) The pharmacology of canceroncoproteogenomeA proteogenome of oncogenes.oneirocriticallyIn terms of dream interpretation.onomatologicallyIn terms of or by means of onomatology.onomatopoeicallyIn an onomatopoeic manner.onomatopoieticalAlternative form of onomatopoetic.ontoepistemology(philosophy) A form of agential realism that is at once an epistemology (theory of knowing), an ontology (theory of being), and an ethics.onychodystrophicRelating to onychodystrophy.onychotillomaniaA compulsion for picking and tearing at one's fingernails or toenails.operationalisticOf or pertaining to operationalism.opercularisationAlternative form of opercularization.opercularizationThe formation and development of the operculumoperculopremotor(anatomy) opercular and premotorophioglossaceous(botany) Belonging to the family Ophioglossaceae of ferns.ophiostomataleanRelating to fungi of the order OphiostomatalesophthalmologicalPertaining to ophthalmology.ophthalmomycosis(medicine) An eye disease caused by a fungus.ophthalmomyiasis(medicine, pathology) Myiasis of the eye.ophthalmoparesis(medicine) A partial or complete paralysis of the extraocular muscles which are responsible for eye movements.ophthalmoparetic(medicine) Of or relating to ophthalmoparesis.ophthalmosaurineAny ophthalmosaurid of the subfamily Ophthalmosaurinaeophthalmoscopiesplural of ophthalmoscopyophthalmoscopistOne who performs ophthalmoscopy.ophthalmotherapy(medicine) Any therapy used against a disease or disorder of the eye.opinionativenessQuality of being opinionative.opiomelanocortin(biochemistry) A polypeptide, found in the pituitary gland, associated with endorphins and other hormonesopisthobranchism(zoology, rare) The property of being an opisthobranch.opisthomastigote(biology) A stage in unicellular life-cycle, typically trypanosomes, where the flagellum is posterior of the nucleus, and passes through a groove in the cell body.opisthosphendoneA plain or ornamented band of fabric, broad in the middle and narrow at the ends, and fastened in the front, used in Ancient Greece to support the hair behind the head.oppositipetalous(botany) Facing a petal.oppositisepalous(botany) Facing a sepal.opsismodysplasia(pathology) A skeletal dysplasia involving delayed bone maturationopsonophagocyticRelated to opsonophagocytosisopsonophagocytisMisspelling of opsonophagocytosis.optoacousticallyIn an optoacoustic way.optoelectricallyIn an optoelectric manneroptomechanicallyBy means of, or in terms of, optomechanics.optomechatronicsThe integration of optical components and technology into mechatronic systems.orbitoprefrontal(anatomy) orbital and prefrontalorbitosphenoidal(anatomy) Of or pertaining to the orbitosphenoid bone.organellogenesisThe creation and development of organellesorganisationallyAlternative spelling of organizationally.organizationallyIn an organizational manner.organoautotrophyA form of mixotrophy based on the oxidation of organic matter to carbon dioxideorganodysprosium(organic chemistry) Describing any organic compound containing a carbon to dysprosium bond.organofunctional(biochemistry, of a substance) Having a function in organisms.organolepticallyIn an organoleptic manner.organolithotrophA chemoautotroph that derives its energy from both organic and inorganic sourcesorganomolybdenum(organic chemistry) Describing any organic compound containing a carbon to molybdenum bond.organophosphaticOf or pertaining to organophosphate.organophosphorus(organic chemistry) describing any of a series of derivatives of phosphorus that have at least one alkyl or aryl group, especially one containing at least one carbon-phosphorus bondorganophosphoryl(organic chemistry, especially in combination) Any organic phosphoryl radicalorganophotoredox(chemistry) Relating to an organic redox reaction that involves lightorganoprotectionprotection from the action of organic compounds, especially from organic free radicalsorganoprotectiveThat provides protection from the action of organic compounds, especially from organic free radicalsorganotechnetium(organic chemistry) Describing any organic compound containing a carbon-to-technetium bond.organotropicallyIn an organotropic manner.ornamentlessnessAbsence of ornaments.ornithogeographyThe study of the geological distribution of birds.ornithoidichnite(paleontology, obsolete) A fossil track resembling that of a bird.ornithologicallyIn terms of ornithology.ornithothoracineAny avialan of the clade Ornithothoracesoromaxillofacial(anatomy) Relating to the mouth, jaw, and face.oromediterraneanRelating to mountainous parts of the Mediterranean regionoropharyngoscopyendoscopy of the oropharynxorthoamphibolite(petrology) Metamorphic rock composed mostly of amphibole, plagioclase, with lesser amounts of epidote, zoisite, chlorite, quartz, titanite, and accessory leucoxene, ilmenite and magnetite derived from an igneous rock.orthobothriotaxyThe evolution of the form of bothria in animalsorthoericssonite(mineralogy) An orthorhombic-dipyramidal reddish black mineral containing barium, hydrogen, iron, manganese, oxygen, and silicon.orthoferrosilite(mineralogy) An iron silicate that crystallizes as an orthorhombic pyroxeneorthogeneticallyIn terms of, or by means of, orthogenesis.orthogeosyncline(geology) A linear geosynclinal belt lying between continental and oceanic cratons, and having internal volcanic belts (eugeosynclinal) and external nonvolcanic belts (miogeosynclinal). Also known as geosynclinal couple; primary geosyncline.orthographically(linguistics) Regarding or relating to orthography (the way in which languages, usually natural languages, are written).orthonormalizingpresent participle and gerund of orthonormalizeorthopantomogramA panoramic radiograph of the whole mouth, including the jaws and teeth.orthopedagogicalRelating to orthopedagogyorthopentamogramMisspelling of orthopantomogram.orthopervanadate(inorganic chemistry) The oxyanion of vanadium VO₆³⁻ or any salt containing this anionorthophasmavirusAny RNA virus of the genus Orthophasmavirusorthophotography(photography) The geometrical correction of aerial photographs so that their displayed distances are rendered uniform and can be measured like a map.orthophotomosaicAn image composed of multiple orthophotosorthopinakiolite(mineralogy) An orthorhombic-dipyramidal black mineral containing boron, iron, magnesium, manganese, and oxygen.orthopneumovirusAny virus of the genus Orthopneumovirus.orthopositronium(physics, attributive) The state of a positronium exotic atom in which the positron and electron have parallel spinsorthopsychiatricOf or pertaining to orthopsychiatry.orthopterologistAn entomologist who studies orthopterology.orthorhombicallyIn an orthorhombic mannerorthorubulavirusAny virus of the genus Orthorubulavirus.orthostereoscopy(optics) The production of a three-dimensional image free from distortionorthosubstitutedHaving undergone orthosubstitution.orthosymmetricalorthosymmetricorthosympatheticOf or pertaining to the sympathetic component of the autonomic nervous systemorthotetrahedralRelating to, or having the form of, an orthotetrahedron.orthotetrahedronA tetrahedron with three pairs of faces at right angles to one another.orthothioformate(organic chemistry) Any orthoester, formally derived from (the unstable) thioformic acid, of general formula HC(SR)₃orthotrichaceous(botany, relational) Of or relating to the Orthotrichaceae.orthotypographic(rare) Of or relating to orthotypography.oscillotonometerA form of sphygmomanometer (for measuring blood pressure) that employs two alternating cuffs that measure systolic and diastolic pressuresoscillotonometryThe measurement of blood pressure by means of an oscillotonometerosmoconformationThe condition of being a osmoconformerosmoheterotrophy(biology) heterotrophy (acquisition of external energy in the form of food) via osmosisosmoregulatorilyIn terms of, or by means of, osmoregulation.osmotransductionosmotic transductionosphresiologicalRelating to osphresiology.osseoaponeurotic(anatomy) Pertaining to an object composed of bone and aponeurosis; at the end of a muscle where it becomes tendon.osseoinductivityMisspelling of osteoinductivity.osseointegrationThe direct structural and functional connection between living bone and the surface of a load-bearing artificial implant (typically a prosthetic limb), typically made of titaniumosseointegrativeRelating to osseointegrationostentatiousnessThe property or characteristic of being ostentatious.osteoarchaeologyThe scientific study of human remains from archaeological sites.osteoarthrectomy(surgery) excision of a joint and (part of) a boneosteoarthropathy(medicine) Any disease of a joint between bonesosteoblastogenicThat promotes the formation of osteoblastsosteoblastopeniaA lack of osteoblastsosteoclastogenicRelating to osteoclastogenesisosteoconductanceosteoconductivityosteocytogenesisThe creation and development of osteocytesosteodistraction(surgery) The surgical correction of skeletal deformities by the lengthening of bonesosteoglossomorphAny fish of the superorder Osteoglossomorpha.osteohydatidosisA type of hydatidosis involving bone.osteoinductivity(uncountable) The condition of being osteoinductive.osteointegrationAlternative form of osseointegration.osteoligamentous(anatomy) Relating to bone and ligamentosteomorphometryThe morphometry of boneosteopathologistA physician or scientist who studies osteopathology.osteoperiostitisinflammation of a bone and its periosteumosteopsathyrosisFragility of the bones, or fragilitas ossium; a condition of softening of the bones, frequently accompanied by spontaneous fractures.osteosarcomatousRelating to osteosarcoma.osteosarcopaeniaAlternative form of osteosarcopenia.osteostimulationThe stimulation of the growth of bone tissue, typically after a fractureosteostimulatoryRelating to osteostimulationostracodologicalOf or relating to ostracodology.ostryopsitrienolA cyclic diarylheptanoid found in the plant Ostryopsis nobilis.oswaldpeetersite(mineralogy) A monoclinic-prismatic canary yellow mineral containing carbon, hydrogen, oxygen, and uranium.otherdimensional(science fiction) From or in another dimension (another plane or parallel universe).otherworldlinessThe quality of being otherworldly.otofaciocervical(anatomy) Relating to the ears, face and neckotolaryngologist(medicine) Synonym of otorhinolaryngologist.otopalatodigital(anatomy) Relating to the ear, palate and fingers, but typically describing a dysplasia that affects these and other parts of the bodyoveraccelerationExcessive acceleration.overaccentuationExcessive accentuation.overaccumulationaccumulation of too muchoveraggressivelyIn an overaggressive way; involving too much aggression.overanaesthetiseAlternative form of overanaesthetize.overanaesthetizeTo anaesthetize excessivelyoveranalyticallyIn an overanalytical way.overapprehensiveExcessively apprehensive.overarticulationexcessive articulationoverboisterouslyIn an overboisterous manner.overburdenednessThe state or condition of being overburdened.overcancellationThe act of overcancelling.overcarelessnessExcessive carelessness.overcautiousnessExcessive cautiousness.overchlorinationExcessive chlorination (usually, of swimming pool water or drinking water).overcivilizationExcessive civilization; the quality of being overcivilized.overcompensatingpresent participle and gerund of overcompensateovercompensationAn excess amount provided in one area in an effort to overcome a perceived lack in another area.overcompensativeExcessively compensativeovercompensatoryTending to overcompensate; providing excessive compensation.overcomplacentlyToo complacently.overcompletenessThe condition of being overcompleteovercomplicatingpresent participle and gerund of overcomplicateovercomplicationThe process of overcomplicating.overconcentratedExcessively concentrated.overcondensationExcessive condensationoverconnectivityExcessive connectivityoverconservatismExcessive conservatism.overconservativeExcessively conservative.overconsolidatedconsolidated to an excessive degreeovercontributionA contribution in excess of a standard or expectation.overcoordinationThe presence of a higher than normal coordination numberovercriticalnessThe quality of being overcritical.overdeliberationDeliberating too much.overdistributionAn excessive distribution (especially of money).overdogmaticallyToo dogmatically.overdramaticallyIn an overdramatic manner.overeffusivenessThe quality of being overeffusive.overemotionalismThe fact of being overemotionaloveremotionalityThe quality of being overemotional.overemotionalize(transitive) To make too emotional.overemphaticallyIn an overemphatic manner.overenthusiasticexcessively enthusiasticoverexaggerationexcessive exaggerationoverexcitabilityThe state of being overexcitable.overexplicitnessThe quality of being overexplicit.overexploitationExcessive and damaging exploitation.overexploitativeExcessively exploitativeoverfastidiouslyIn an overfastidious manner.overfeminizationexcessive feminizationoverfermentationexcessive fermentationoverfriendlinessThe quality of being too friendlyoverglycosylated(biochemistry) Excessively glycosylatedoverhumanisationAlternative form of overhumanization.overhumanizationExcessive humanization; the process of overhumanizing.overidealizationexcessive idealizationoverilluminationExcess light supplied beyond the amount required for a given task.overillustrationExcessive illustration.overimmunization(American spelling) The administration of unnecessary immunizations.overimprisonmentSynonym of overincarceration.overincarceratedOf whom a disproportionate number are in prison.overindebtednessThe quality of being too deeply in debt.overintellectualExcessively intellectual.overlegalizationExcessive legalization.overmasturbationexcessive masturbationovermodificationExcessive modification.overnumerousness(rare) The quality or condition of being too numerous.overoptimizationThe act or process of overoptimizing.overorganisationNon-Oxford British English standard spelling of overorganization.overorganizationToo much organizing.overossificationExcessive ossificationoverparameteriseAlternative form of overparameterize.overparameterize(transitive, intransitive, statistics) To use an excessive number of parameters.overparametrizedExcessively parametrized; having too many parametersoverparenthesizeTo use excessive parenthesis.overparticularlyIn an overparticular manner.overpassionatelyIn an overpassionate manner.overpedanticallyToo pedantically.overpenalization(law) The process of administering excessive punishment, especially in response to crime.overphotographedOf which too many photographs have been taken.overpigmentationExcessive pigmentation.overpolarizationExcessive polarization.overpopulousnessThe quality of being overpopulous.overpowerfulnessThe quality of being overpowerful.overpoweringnessThe quality of being overpowering.overprescriptionPrescription of a drug more frequently than appropriate.overpresumptuousExcessively presumptuous.overproliferatedExcessively proliferatedoverproportionalRelating to overproportionoverproportionedsimple past and past participle of overproportionoverprotectivelyIn an overprotective way.overprotectivism(rare) The qualities, attitudes, and behaviours associated with being overprotective.overpsychologize(transitive) To psychologize excessively.overreachingnessThe quality of being overreaching.overrefrigeratedExcessively refrigerated.overresponsivityThe quality of being overresponsive.overromanticallyIn an overromantic way.oversanitizationExcessive sanitization.overscrupulosityoverscrupulousnessoverscrupulouslyIn an overscrupulous manner.oversegmentation(computing) A division into too many segments, as when attempting to recognize parts of an image.oversolicitouslyToo solicitously.overspaciousnessExcessive spaciousness.overstudiousnessExcessive studiousness.oversubscriptionA subscription for more than is available.oversubstitutionExcessive substitutionoversupplementedsimple past and past participle of oversupplementoversurveillanceAn excessive degree of surveillance.oversuspiciouslyIn an oversuspicious manner.overtechnicalityExcessive technicality.overtimorousnessExcessive timorousness.overtransmission(genetics) Excessive transmissionoverurbanizationExcessive urbanizationoverweightednessQuality of being overweighted.overwhelmingnessThe property of being overwhelming.ovomacroglobulin(biochemistry) Any of a class of macroglobulins found in hen's eggsovovegetarianismThe practice of following an ovovegetarian diet.oxazaphosphorine(medicine) Any of a family of anticancer drugs that contain this structureoxazinoquinoline(organic chemistry) The heterocycle 2,3,4,5-tetrahydro[1,4]oxazino-[2,3,4-ij]quinolin-5-oneoxazolidinedione(organic chemistry) A five-membered saturated heterocyclic ketone having one nitrogen atom, one oxygen atom and two carbonyl groups.oxidonitrosativeSynonym of nitrosative, but especially relating to nitrogen dioxideoxidosensitivity(biochemistry) sensitivity to redox reactionsoxobiodegradableAlternative form of oxybiodegradable.oxodicarboxylate(organic chemistry) Any derivative of a dicarboxylate in which a methylene group has been replaced by a carbonyl groupoxophytodienoateAny salt or ester of oxophytodienoic acid; they are jasmonate phytohormones.oxosulfoselenide(inorganic chemistry) Any compound containing bonds from a metal atom to atoms of oxygen, sulfur and seleniumoxybiodegradableBiodegradable in the presence of oxygen.oxygenolytically(organic chemistry) In an oxygenolytic manneroxykinoshitalite(mineralogy) A monoclinic mineral containing aluminium, barium, magnesium, oxygen, silicon and titanium.oxyorthosilicate(inorganic chemistry) A mixed oxide and orthosilicateoxyphencyclimineA particular antimuscarinic drug.oxytetrafluoride(inorganic chemistry) Any ternary compound containing one oxygen atom and four fluorine atomsoxythiomolybdateAn anion containing molybdenum, sulfur, and oxygen, specifically MoOS₃⁻².
Use These Words
Open any word for its full definition, examples, synonyms, antonyms, and related vocabulary. Every item is an existing dictionary entry; phrases, hyphenated terms, and malformed headwords are excluded.