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ichthyotoxinAny chemical compound that is toxic to fish.icosihenagon(geometry) A polygon with twenty-one edges and twenty-one angles.idealisationAlternative spelling of idealization.idealizationThe act or process of idealizing.identitarianBased on a notion of group identity; relating to the ideology of identitarianism.ignorization(nonce word) The act of ignorizing.ikarugamycin(medicine) A macrocyclic antibiotic isolated from some species of StreptomycesillimitationLack of limitations; freedom from checks or restraints.illitisationUK, Ireland, Australia, New Zealand, and South Africa spelling of illitization.illitization(mineralogy) conversion into illiteillucidationAlternative form of elucidation.illuminationThe act of illuminating, or supplying with light; the state of being illuminated.illustrationThe act of illustrating; the act of making clear and distinct.imidafenacinA urinary antispasmodic of the anticholinergic class.imidazopyran(organic chemistry) Any bicyclic heterocycle formed by the fusion of an imidazole and a pyranimmiserationSynonym of immiserization (“the process of making miserable or poor, especially of a population as a whole; impoverishment, pauperization”).immoderationLack of moderation.immunevasionAlternative form of immune evasion.immunisation(British spelling, immunology) Alternative spelling of immunization.immunization(US, countable) One such exposure.immunocolumn(immunology) A column used for the chromatographic separation of immune cellsimmunoevasin(biochemistry) Any of a family of immunoevasive proteins expressed by sum virusesimmunoglobin(immunology, biochemistry) Any protein that functions as an antibodyimmunolectin(biochemistry, immunology) Any lectin associated with the immune systemimmunolesion(immunology) immunological lesionimmunophilin(biochemistry) Any of a class of isomerases active in the immune system.imperatorian(obsolete) imperialimperceptionLack of perception; failure to perceive.imperfection(uncountable) Those qualities or features that are imperfect; the characteristic, state, or quality of being imperfect.impinguation(obsolete, rare) The act of fattening, or the state of being fat or fattened.implantation(anatomy) The way in which an organ, bone, muscle etc. becomes inserted into its set place.impregnationThe act of making pregnant; fertilization.inactivationThe process of rendering something inactive.inadaptationLack of adaptation; unsuitableness.inadequation(nonstandard or obsolete) inadequacyinanitiation(medicine) Archaic form of inanition.inaugurationThe act of inaugurating, or inducting into office with solemnity; investiture by appropriate ceremonies.incameration(obsolete, Roman Catholicism) The incorporation of certain property, rights, or income into the dominion of the Pope.incatenation(archaic) The act of linking together; enchaining.incinerationThe act of incinerating, or the state of being incinerated; cremation.incompassion(obsolete) Lack of compassion.incompletion(uncountable) The state or quality of not being complete.inconclusionLack of conclusion.inconcoction(obsolete) The state of being undigested, unripe, or immature.inconnection(archaic) disconnectionincorrectionA lack of correction or discipline.incorruption(archaic) The state of being incorrupt.incrassationThe process of thickening.incrustationThe act of incrusting, or the state of being incrusted.indeclensionthe state of being grammatically indeclinableindenizationArchaic form of endenization.indigitationThe act of pointing out with or as if with the finger; indication.indiscretionThe quality or state of being indiscreet; lack of discretionindolization(organic chemistry) A chemical process that produces indoles.indomethacinAlternative form of indometacin.inertizationThe use of an inert gas to prevent explosioninescutcheon(heraldry) A small escutcheon (“coat of arms; shield”) (such as an escutcheon of pretence) which is charged (“represented”) on a larger escutcheon.inexpressionLack of expression; failure to express.infantaricinAny of a group of bacteriocins produced by a strain of Streptococcus infantariusinfibulationAn act of fasteninginfiltrationThe act or process of infiltrating, as of water into a porous substance, or of a fluid into the cells of an organ or part of the body.inflammation(now rare) The act of inflaming, kindling, or setting on fire.infoxicationinformation overloadinfraduction(medicine) The turning downward of a part, especially of the eye.infrasection(taxonomy) a taxon below the rank of sectioninfraversionThe downward movement of the eyes.ingeminationRepetition; reduplication; reiteration.ingeneration(dated) generation; the creating or causing of somethingingratiationThe state of being ingratiating.inhabitationThe act of inhabiting, or the state of being inhabited; indwelling.innoculationAlternative spelling of inoculation.inocculationObsolete form of inoculation.inoccupationLack of occupation (being busy); lack of something to do.inordination(obsolete) Deviation or irregularity from custom, rule, order, or rightinosculationThe junction or connection of vessels, channels, or passages, so that their contents pass from one to the other; union by mouths or ducts; intercommunication.inquartation(chemistry, archaic) quartationinquietation(obsolete) disturbanceinsalivation(physiology, dated) The mixing of food with saliva during mastication.insanitationLack of sanitation; unhygienic conditions.insectivoranAny animal of the former order Insectivorainsectotoxin(biochemistry) A toxin that specifically affects insects.inseminationA sowing of seed; the act of inseminating.inspissationThe act of thickening.installationAn act of installing.instaurationA restoration after decay or dilapidation; a renewal; a repair.instellation(astronomy) A generalization of insolation to stars other than the sun.instillationThe act of instilling.instrengthen(transitive, rare) Strengthen inwardly.insubjection(especially religion) Lack of subjection or obedience.insubmissionLack of submission; disobedience.insufflationThe action of breathing or blowing into or on.insurrection(uncountable) The action of part or all of a national population violently rising up against the government or other authority; (countable) an instance of this; a revolt, an uprising; specifically, one that is at an initial stage or limited in nature.intabulation(music) an arrangement of a vocal or ensemble piece for keyboard, lute, or other plucked string instrument, written in tablature.integramycin(organic chemistry) A particular hexacyclic natural product isolated from Actinoplanes that inhibits the action of integraseintegumation(botany, zoology) The branch of physiology that deals with integuments.intellection(uncountable) The mental activity or process of grasping with the intellect; apprehension by the mind; understanding.interceptionAn act of intercepting something, the state of being intercepted, or a thing that is intercepted.intercessionThe act of intervening or mediating between two parties.interclusioninterception; a stopping or obstruction (literal or figurative)intercohesin(biochemistry) Between cohesin moleculesinterdictionThe act of interdicting or something interdicted.intereditionBetween editions of a publication.interexcitonBetween excitons.interfactionBetween factions.interfectionThe act of murder or killing.intergrationMisspelling of integration.interhalogen(inorganic chemistry) Involving a bond between two halogens, or a compound formed by such a bond.interjectionAn interruption; something interjectedintermention(obsolete) To mention among other things, or casually or incidentally.intermissionA break, especially between two performances or sessions, such as at a concert, play, seminar, or religious assembly.intermonsoonOccurring between monsoonsintermundianObsolete form of intermundane.internection(obsolete) intimate connectioninternucleonBetween nucleonsinterplinian(volcanology) Between major eruptions.interpolygonBetween polygons.interproteinBetween proteinsinterpterion(anthropology) Between the two pteria.interruptionThe act of interrupting, or the state of being interrupted.intersectionThe junction of two (or more) paths, streets, highways, or other thoroughfares.intersertion(obsolete) The act of interserting, or that which is interserted.intersessionBetween sessions.interstationBetween stations.interstitionAn interstice or interstitium; an interstitial space.interventionThe action of intervening; interfering in some course of events.interversionThe swapping of positions within a sequence; transposition or permutation.intimidationThe act of making timid or fearful or of deterring by threats; the state of being intimidated.intoleration(dated) Intolerance.intoxicationA poisoning, as by a spirituous or a narcotic substance.intraballoonWithin a balloonintracohesinwithin a cohesin moleculeintraexcitonWithin a single exciton.intraovarianWithin an ovaryintrapolaron(physics) Within a polaronintraprotein(biochemistry) Within a protein moleculeintrasessionWithin a single session.intrastationWithin a single station.intravastionMisspelling of intravasation.introcession(archaic, medicine) A depression or inward sinking of parts.introductionThe act or process of introducing.introflexion(medicine) A bending inward.introjection(psychology) The process whereby the ideas of another are unconsciously incorporated into one's own psyche.intromissionThe state of being allowed to enter; admittanceintroversionA turning inward, particularly:invagination(medicine) The process where an anatomical part invaginates upon itself or into another structure.invalidationThe act of invalidating, or the state of being invalidatedinveterationThe act of making inveterate.invigilationThe act of watching or invigilating.invigorationThe act of invigorating or the state of being invigorated.invultuationA form of witchcraft: piercing a wax or clay image of a person in order to harm them.iodoformogenA light powder, a compound of iodoform and albumin, used as a substitute for iodoform.iodosulfuron(organic chemistry) The herbicide 4-iodo-2-[(4-methoxy-6-methyl-1,3,5-triazin-2-yl)carbamoylsulfamoyl]benzoic acidionosorption(chemistry) The chemisorption of ionsipsatizationThe process of ipsatizing.iristectorin(organic chemistry) Any of a class of flavonoids found in the plant Iris tectorum.irreflection(dated) Lack of reflection or consideration.irrepublican(archaic) unrepublicanirresolutionLack of resolution; lack of decision or purpose; vacillation.isobergapten(organic chemistry) A particular furocoumarin.isocicutoxin(biochemistry) A toxic chemical from Cicuta virosa with IUPAC name (8Z,10E,12E)-heptadeca-8,10,12-trien-4,6-diyne-1,14-diol.isodalbergin(organic chemistry) A flavonoid, C₁₆H₁₂O₄, that is a minor component of the heartwood of Dalbergia sissoo, used in Chinese medicine.isoechinulin(organic chemistry) One of a family of similar alkaloids derived from Aspergillus. Isoechinulin A has IUPAC name (3Z,6S)-3-((2-(1,1-Dimethyl-2-propen-1-yl)-5-(3-methyl-2-buten-1-yl)-1H-indol-3-yl)methylene)-6-methyl-2,5-piperazinedione; B has an extra double bond and C has an additional epoxide moiety.isoginkgetin(organic chemistry) The biflavonoid 8-[5-(5,7-dihydroxy-4-oxo-4H-1-benzopyran-2-yl)-2-methoxyphenyl]-5,7-dihydroxy-2-(4-methoxyphenyl)-4H-1-benzopyran-4-one that suppresses transcriptional elongation of nMRAisomalathionAn impurity found in some batches of malathion, significantly more toxic to humans than malathion.isopolyanion(inorganic chemistry) Any anion derived from an isopoly acid.isoporphyrin(organic chemistry) Any of several isomeric forms of porphyrin; vis:- porphycene, corrphycene, hemiporphycene, isoporphycene and N-confused porphyrinisoquercetin(organic chemistry) A glucoside of quercetinisoquercitinMisspelling of isoquercetin.isorhamnetinAn O-methylated flavonol found in Tagetes lucida.isorhodopsinAn isomer of rhodopsin formed when it absorbs lightisoriccardinAny of a group of bisbibenzyls present in liverwortisoswertisin(organic chemistry) A flavonoid, present, typically as a glycoside, in some cerealsisotretinoin(organic chemistry, pharmacology) A cis isomer of retinoic acid that is a synthetic derivative of vitamin A, inhibits sebaceous gland function and keratinization, and is used in the treatment of severe inflammatory acne but is contraindicated in pregnancy because of its implication as a cause of birth defects.