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dacryocystocele(embryology, ophthalmology) A benign, bluish-gray mass in the inferomedial canthus that forms as a result of a narrowing or obstruction of the nasolacrimal duct, usually during prenatal development.davallialactoneA phenolic lactone (4Z)-3-(3,4-dihydroxyphenyl)-6-[(E)-2-(3,4-dihydroxyphenyl)ethenyl]-8-hydroxy-4-(2-oxopropylidene)-3,3a-dihydrofuro[3,4-c]oxepin-1-one related to hispidindebromomarinoneAn antibiotic produced by marine actinomycetes.debureaucratiseAlternative spelling of debureaucratize.debureaucratize(transitive) To reduce the amount of bureaucracy involved in decision making.decabillionaire(rare) A person whose wealth is greater than ten billion (10¹⁰) dollars, or other currency.decamillionaireA person whose wealth amounts to ten million dollars (or other currency unit).decarbonylativeThat decarbonylatesdecarboxylativeThat decarboxylatesdecategorialiseNon-Oxford British English standard spelling of decategorialize.decategorializeTo undergo decategorialization.decentralizableCapable of being decentralized.decommercialize(transitive) To make not commercial.deconceptualiseAlternative spelling of deconceptualize.deconceptualize(transitive) To divest of concepts.deconstructableAble to be deconstructed.deconstructibleAlternative form of deconstructable.decontextualiseAlternative spelling of decontextualize.decontextualize(transitive) To divest of context.decylubiquinone(organic chemistry) The 6-decyl derivative of ubiquinonededifferentiateTo lose or reverse differentiationdeepithelialize(surgery) To remove epithelial tissuedefibrinogenateTo induce defibrinationdefunctionalize(computing, programming) To subject to defunctionalization.deglucuronidase(biochemistry) Synonym of glucuronidase.dehemoglobinize(transitive) To remove the hemoglobin from.dehydrobutyrineThe dehydroamino acid derived from dehydration of threonine.dehydrochloride(organic chemistry) A condensation reaction in which the elements of hydrochloric acid (HCl) are removed.dehydroecdysone(organic chemistry) Any of several isomeric steroids; 3-dehydroecdysone plays a role in insect hormone biosynthesisdehydrogenative(chemistry) That causes dehydrogenationdehydromorphineSynonym of pseudomorphine.dehydrorotenoneA dehydro derivative of rotenone, having anti-inflammatory effects.dehydrosqualene(organic chemistry) An apocarotenoid intermediate in the biosynthesis of carotenoidsdeindividualiseAlternative form of deindividualize.deindividualize(transitive) To strip of individuality.deindustrialiseAlternative spelling of deindustrialize.deindustrialize(transitive, intransitive) To subject to deindustrialization; to deprive of industry.dellaventuraite(mineralogy) A monoclinic-prismatic pinkish red mineral containing aluminum, calcium, hydrogen, iron, lithium, magnesium, manganese, nickel, oxygen, potassium, silicon, sodium, titanium, and zinc.demibillionaireA person who has a half a billion dollars, pounds, or other currency.dendrocolaptine(zoology) Of or relating to the bird subfamily Dendrocolaptinae of woodcreepers.dendrofullerene(organic chemistry) A dendritic adduct of fullerenedendrosterosideA particular steroid glycoside.deoxychorismate(biochemistry) A reduced form of chorismate that is a precursor to the biosynthesis of folic aciddeoxycytidylate(biochemistry) Any salt or ester of deoxycytidine.deoxyhypusinate(biochemistry) To modify by the addition of deoxyhypusinedeoxyketohexose(biochemistry) Any deoxysugar derived from a ketohexosedeoxynucleoside(biochemistry) Any nucleoside containing a deoxy sugardeoxynucleotide(biochemistry, genetics) Any nucleotide that contains a deoxy sugardeoxypiridoxineMisspelling of deoxypyridoxine.deoxypyridoxine(organic chemistry) Any deoxy form of pyridoxine, but especially 4-deoxypyridoxine which is a vitamin B6 antagonistdeoxyribomutasephosphopentomutasedepartmentaliseAlternative spelling of departmentalize.departmentalizeTo organize something into departmentsdephlogisticateTo take away the phlogiston, i.e. ability to burn, which is now understood to be chemically impossibledephosphonylate(organic chemistry) To remove a phosphonyl group from.dephosphorylase(biochemistry) An enzyme that catalyses the hydrolysis of a sugar phosphatedephosphorylateTo cause, or undergo dephosphorylationdepolymerizableCapable of being depolymerized.depressurizableCapable of being depressurized.deprovincialize(transitive) To make less of provincial.dereferenceable(programming) That can be dereferenced.desferrioxamine(medicine) deferoxaminedesglymidodrine(organic chemistry) 2-amino-1-(2,5-dimethoxyphenyl)ethanol, a metabolite of midodrinedesoxyadenosineAlternative form of deoxyadenosine.desoxyephedrineSynonym of methamphetaminedesoxythymidineAlternative form of deoxythymidine.deuterochloride(chemistry) A hydrochloride in which the hydrogen is replaced by deuteriumdexelvucitabine(pharmacology) A failed experimental drug for the treatment of HIV.dexfenfluramineA serotonergic anorectic drug used for weight loss in the 1990s, later withdrawn because of cardiovascular side-effects.dexlansoprazole(pharmacology) A drug C₁₆H₁₄F₃N₃O₂S that acts as a proton pump inhibitor to reduce gastric acid secretion and is administered orally in the treatment of heartburn associated with gastroesophageal reflux disease and to promote healing of acid-related erosive esophagitis. It is the dextrorotatory enantiomer of lansoprazole and is marketed under the trademark Dexilant.dexmedetomidine(medicine) An aromatic imidazole derivative that is used as a sedative and analgesicdextamphetamineAlternative form of dextroamphetamine.dextrothyroxineA drug that increases hepatic lipase.diacetylcholineSynonym of succinylcholine.diacylglyercideSynonym of diglyceride (of a typical fatty acid)diacyltrehalose(organic chemistry) A diacyl derivative of trehalosedialkylsilylene(organic chemistry) A silylene where the silicon atom is connected to two alkyl groups.diaminobenzoate(organic chemistry) Any diamino derivative of a benzoate group or iondiaminofluorene(organic chemistry) Any diamino derivative of fluorene but especially 2,7-diaminofluorene that is an analytical reagentdiaminofluorineMisspelling of diaminofluorene.diaminopimelate(organic chemistry) Any salt or ester of diaminopimelic aciddiaminopyridine(organic chemistry) Any of several isomeric diamino derivatives of pyridinediaminotriazine(organic chemistry) Any diamino derivative of a triazinedianthraquinone(organic chemistry) The bianthraquinone that is linked via the two central ringsdiarylacetylene(organic chemistry) Any diaryl derivative of acetylenediarylmaleimide(organic chemistry) Any diaryl derivative of maleimidediarylmethylene(organic chemistry, especially in combination) Any diaryl derivative of a methylene radical Ar₂C=diarylpropylene(organic chemistry) Any diaryl derivative of propylenediarylquinoline(organic chemistry) A quinoline containing two aryl groupsdiarylrhodamine(organic chemistry) Any diaryl derivative of rhodaminediazaanthracene(organic chemistry) Any of several isomeric tricyclic aromatic heterocycles derived from anthracene by replacement of two CH groups by nitrogen atomsdiazafluorenone(organic chemistry) Any diaza derivative of a fluorenonedibenzalacetoneSynonym of dibenzylideneacetone.dibenzimidazole(organic chemistry) A tricyclic heterocycle consisting of two benzene rings fused to one of imidazoledibenzopyrazine(organic chemistry) Synonym of phenazine.dibenzothiazinephenothiazinedibenzoxazepineAn incapacitating and lachrymatory agent, developed by the British Ministry of Defence for riot control in the late 1950s and early 1960s, whose derivatives have some pharmaceutical applications.dibenzpentacene(organic chemistry) Any of several isomeric polycyclic aromatic hydrocarbons in which two benzene rings are fused to a pentacene molecule, but especially 1,2,8,9-dibenzpentacene.dibromopyridine(organic chemistry) Any of 10 isomeric dibromo derivatives of pyridinedichloroacetate(organic chemistry) Any salt or ester of dichloroacetic acid.dichloroaniline(organic chemistry) Any of several isomeric dichloro derivatives of anilinedichlorobenzene(organic chemistry) Any of three isomeric derivatives of benzene in which two hydrogen atoms have been replaced by chlorine; they are used as solvents and in organic synthesis.dichlorocarbene(organic chemistry) A common carbene with chemical formula CCl₂.dichloromethane(organic chemistry) The partially halogenated hydrocarbon CH₂Cl₂ widely used as a solventdichlorotoluene(organic chemistry) Any dichloro derivative of toluenedickthomssenite(mineralogy) A monoclinic-prismatic light golden brown mineral containing hydrogen, magnesium, oxygen, and vanadium.dicranostigmine(organic chemistry) An alkaloid, related to pyridostigmine, present in the poppy Dicranostigmadicyanovinylene(organic chemistry, especially in combination) Any dicyano derivative of a vinylene groupdideoxycitidineMisspelling of dideoxycytidine.dideoxycytidine(pharmacology) Alternative form of zalcitabine.diethylmalonateAlternative form of diethyl malonate.differentialize(rare) Synonym of differentiate.differentiativeThat differentiates, or causes differentiationdifluocortoloneA corticosteroid.difluorocarbene(organic chemistry) The radical F₂C: used in organic synthesisdifluorodiazene(inorganic chemistry) Either of two cis-trans isomers of the compound FN=NFdifluoromethane(organic chemistry) A dihalogenoalkane in which two of the four hydrogen atoms of methane are replaced by fluorine, used as a refrigerant.digalactosidase(biochemistry) Any enzyme that catalyses the hydrolysis of a digalactosidedigalacturonate(organic chemistry) Any compound that has two galacturonate groupsdiheterabenzene(organic chemistry) Any heterocycle formally derived from benzene by replacing two carbon atoms by heteroatomsdihomolinoleate(organic chemistry) Any salt or ester of dihomolinoleic aciddihydroceramide(biochemistry) The biochemical precursor of ceramide, into which it is converted by the enzyme dihydroceramide desaturasedihydrochalcone(organic chemistry) A hydrogenated derivative of chalcone that is the basis of many biologically active compoundsdihydrochloride(chemistry) Any hydrochloride formed by reaction with two molecules of hydrochloric aciddihydrochryseneA chemical compound, C₁₈H₁₄.dihydrocytosine(biochemistry) A hydrogenated form of cytosine, 5,6-dihydrocytosine, that is an intermediate in DNA productiondihydroergoline(organic chemistry) Any dihydro derivative of ergolinedihydroergosine(organic chemistry) An alkaloid present in sorghum (Sphacelia sorghi)dihydromorphine(pharmacology) A particular narcotic painkiller.dihydropteroate(organic chemistry) A pterin created from para-aminobenzoic acid by the enzyme dihydropteroate synthetase, an important intermediate in folate synthesis.dihydropyrazole(organic chemistry) Any dihydro derivative of a pyrazoledihydropyridineA molecule based upon pyridine, the parent of a class of molecules that have been semi-saturated with two substituents replacing one double bond.dihydroxybutane(organic chemistry) Any dihydroxy derivative of butane; Synonym of butanediol.dihydroxyindole(organic chemistry) Any dihydroxy derivative of an indole, but especially 5,6-dihydroxyindole that is a melanin precursordihydroxyketone(organic chemistry) Any dihydroxy derivative of a ketonediiodoacetylene(organic chemistry) An explosive iodine derivative of acetylene I-C≡C-Idiiodothyronine(organic chemistry) Any of several isomeric diiodo derivatives of thyroninedimetamfetamineThe drug dimethylamphetamine.dimethoxydecane(organic chemistry) Any dimethoxy derivative of a decanedimethoxyethane(organic chemistry) The dimethyl ether of ethylene glycol; it used as a solventdimethylaniline(organic chemistry) The tertiary amine C₆H₅N(CH₃)₂ used in the manufacture of the explosive tetryldimethylbenzene(organic chemistry) xylenedimethylglycine(organic chemistry) A derivative of glycine in which both hydrogen atoms of the amino group are replaced by methyl groupsdimethylpropane(organic chemistry) Synonym of neopentane.dimethylsulfateAlternative spelling of dimethyl sulfate.dimethylsulfideAlternative spelling of dimethyl sulfide.dimethylsulfoneAlternative form of dimethyl sulfone.dioctylfluorene(organic chemistry) A dioctyl derivative of fluorenedioxopiperazine(organic chemistry) Any of several isomeric diketones derived from piperazinediphenhydramine(pharmacology) An antihistamine and anticholinergic drug that blocks the effect of histamine at H₁ receptor sites, relieving allergy symptoms. It also reduces smooth muscle contraction, increases heart rate, and sedates the user by blocking muscarinic acetylcholine receptors (mAChRs).diphenoloxidase(biochemistry) Any of a class of copper-containing oxidoreductase enzymes that oxidize catechols to quinonesdiphenylalanine(organic chemistry) A synthetic amino acid, 2-amino-3,3-diphenyl-propionic aciddiphenylmethane(organic chemistry) The aromatic hydrocarbon (C₆H₅)₂CH₂; it is an intermediate in the synthesis of many other compoundsdiphenylpentane(organic chemistry) Any diphenyl derivative of pentane, but especially 1,1-diphenylpentane or 1,5-diphenylpentanediphosphokinase(biochemistry) pyrophosphate kinasediphosphoribose(biochemistry) ribose diphosphatediphosphorylase(biochemistry) Any enzyme that catalyzes a diphosphorylation recationdiplochromosome(genetics) A chromosome, containing four chromatids, produced by two rounds of DNA replication without normal chromosome separationdisacquaintance(obsolete) Loss of familiarity, or familiar acquaintance.disaffectionateNot disposed to affection; unfriendly.disassimilative(especially physiology) Having power to disassimilate; of the nature of disassimilation.discombooberate(transitive, slang) Synonym of discombobulate.discommensurate(physics) Not commensuratedisconfirmativeThat disconfirmsdiscontinuative(linguistics) Indicating discontinuation.discriminatableAlternative form of discriminable.disialyllactose(organic chemistry) Any disialyl derivative of lactosedisintermediate(ambitransitive, business, banking, finance) To carry out disintermediation, to remove another from intermediation.distinguishableAble, or easily able to be distinguished.dithiocarbamate(inorganic chemistry) Any salt or ester of dithiocarbamic aciddithiocarbonate(inorganic chemistry) The anion COS₂²⁻ formally derived from carbonate by the replacement of two oxygen atoms by sulfurdithiophosphate(inorganic chemistry) Any thiophosphate in which two oxygen atoms have been replaced by sulfurdmisteinbergite(mineralogy) A colourless mineral, a hexagonal polymorph of anorthite, with the chemical formula CaAl₂Si₂O₈.docosahexenoate(organic chemistry) Any salt or ester of docosahexenoic aciddocosatrienoate(organic chemistry) Any salt or ester of docosatrienoic aciddocumentarylikeResembling a documentary.dodecacarbonate(chemistry, in combination) A chemical compound containing twelve carbonate ions. (CO₃)₁₂.dodecahistidineTwelve contiguous histidine amino acids, typically in a terminal position of some enzymesdodecahydroxide(chemistry, in combination) A chemical compound containing twelve hydroxide ions. (OH)₁₂dodecanophenoneAn organic marker, C₁₈H₂₈O, that is used for the determination of electroosmotic velocity.dodecylsulphateAlternative form of dodecylsulfate.dopaminoceptiveHaving a receptor sensitive to dopaminedorsibranchiate(obsolete, zoology) Having branchiae along the back; belonging to the former order Dorsibranchiata.dorsoretrograde(anatomy) dorsal and retrogradedorsoventralizeTo move to a dorsoventral positiondownregulatableAble to be downregulated.duodecasyllableAlternative form of dodecasyllable.