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abaddon(archaic, British slang) An informer; a criminal who informs on other criminals to the authorities.abaecin(biochemistry) An antimicrobial peptide present in some insectsabandon(transitive) To give up or relinquish control of, to surrender or to give oneself over, or to yield to one's emotions.abbrevnAbbreviation of abbreviation.abdomen(zoology, entomology) The posterior section of the body, behind the thorax, in insects, crustaceans, and other Arthropoda.abelian(mathematics) Of an algebraic structure (usually a group or algebra), having a commutative defining operation.abhuman(science fiction) A partially human creature.abietin(organic chemistry) A resin obtained from Strasburg turpentine or Canada balsam. It is without taste or smell, is insoluble in water, but soluble in alcohol (especially at the boiling point), in strong acetic acid, and in ether.abiocenAlternative spelling of abiocoen.abortinAn extract manufactured from the bacterium Brucella abortus, and is used to study contagious abortions in cattle.abstain(transitive, reflexive, obsolete) Keep or withhold oneself.abthainAlternative form of abthane.aburdenTo burden, oppressaburton(nautical) With the length athwartship.abusion(obsolete) Misuse, abuse; in particular, illegal behaviour; verbal, physical or sexual abuse.acaciin(organic chemistry) A glycoside found in the leaves of a false acacia tree, Robinia pseudoacacia; C₂₈H₃₂O₁₄.acarianAny mite or tick of the subclass Acari.acetoin(organic chemistry) The compound 3-hydroxybutanone CH₃-CO-CH(OH)-CH₃ that is one of the constituents of the flavour of butterachatin(biochemistry) A neuroexcitatory peptide, from a snail of the genus Achatina, that enhances the amplitude and frequency of the heartbeat.acifranAn antilipidemic drug.acketonAlternative form of aketon.acknownpast participle of acknowacraeinA distasteful substance produced by some butterflies as a defence mechanismacrasinA chemotactic agent produced by some slime mouldsacremanA leader of a plowing team in medieval England.acridan(organic chemistry) The aromatic secondary amine 9,10-dihydroacridine related to acridineacridinDated form of acridine.acritan(obsolete) Any animal that is a member of the Acritaacrogen(biology) any flowerless plant whose growth takes place at the tip of the main stem, especially the cryptogam fernsacrosin(biochemistry) A proteolytic enzyme, found in the acrosome of spermatozoa, that enables penetration of the egg.actifan(dated, fandom slang) A person, particularly a fan of science fiction, involved in fanac or fan activity.actinin(biochemistry) Any of several microfilament proteins that have a function in the attachment of actin fibres in muscle cellsactinon(physics, dated) Radon-219 (21986Rn; symbol An), an isotope of radonactivinA peptide that participates in the regulation of the menstrual cycle, cell proliferation, apoptosis, metabolism, and many other diverse functions.acyloin(organic chemistry) Any α-hydroxy ketone.adaptin(biochemistry) Any of a class of proteins that interact with membrane-bound receptors to assemble clathrin-coated vesiclesadducin(biochemistry) Any of a group of related actin-regulating proteins.adenain(biochemistry) An endopeptidase that catalyses the cleavage of adenovirus proteinsaderminSynonym of pyridoxine.adherinA cadherin that regulates the loading of the cohesin complex onto chromosomesadhesin(biochemistry) Any of several factors that enable bacteria to adhere to epithelial surfaces as a step towards infection.adipsin(biochemistry) A peptidase that is secreted by adipocytes into the bloodstream and is involved in the suppression of infectionadjourn(transitive) To postpone.adwomanA woman working in advertising; a female adman.adwomenplural of adwomanaegipan(Greek mythology) A goat-like creature resembling a satyr, sometimes portrayed as having a fish's tail.aeolianof, or relating to the wind.aeonian(Commonwealth) Alternative spelling of eonian.aerogun(dated) An antiaircraft cannon.affitin(biochemistry) Any of a group of synthetic proteins that bind antigensafrican(nonstandard) Alternative letter-case form of African.afzelin(organic chemistry) A flavonol glycoside, the rhamnoside of kaempferol, found in Nymphaea odorata (American white waterlily).agluconAlternative form of aglucone.aglyconAlternative spelling of aglycone.agnomenAn additional cognomen given, as an honour, to a Roman citizen.agrocinA particular bacteriocin produced by bacteria of species Agrobacterium radiobacter.aileronThe hinged part on the trailing edge of an airplane wing, used to control longitudinal turns.aionianAlternative spelling of eonian.airhornA noise-making device that blasts compressed air through a hornajowainAlternative form of ajwain.ajwayanAlternative form of ajwain.alantin(biochemistry, obsolete) Inulin.alarmin(biochemistry) Any endogenous substance that signals tissue and cell damagealaternAn ornamental evergreen shrub (Rhamnus alaternus; Italian buckthorn).alation(uncountable) The state of being winged.albumenThe white part of an egg; being mostly the protein albumin and water.albumin(biochemistry) Any of a class of monomeric proteins that are soluble in water, and are coagulated by heat; they occur in egg white, milk etc; they function as carrier protein for steroids, fatty acids, and thyroid hormones and play a role in stabilizing extracellular fluid volume.alerion(heraldry) A heraldic eagle, especially one displayed without legs/feet or beak.alestinSynonym of azelastine.aleuronAlternative form of aleurone.alicorn(fantasy, proscribed) A mythological creature, a mixture of pegasus and unicorn: a winged horse with a single horn on its head.allicin(organic chemistry) An organic compound, diallyl thiosulfinate, obtained from garlic, with a variety of medicinal and antibacterial properties.allixinA chemical derived from encrustation on aged garlic cloves, 3-hydroxy-5-methoxy-6-methyl-2-pentyl-4H-pyran-4-onealloton(physics) A particle that carries an imaginary electric charge; posited to account for dark matteralloxan(biochemistry) An oxidation product of uric acid, 2,4,5,6(1H,3H)-pyrimidinetetrone, capable of inducing diabetes by destroying pancreatic tissuealmsman(obsolete) One who depends on the receipt of alms, a beggar.almsmenplural of almsmanalnulin(biochemistry) taraxasterolaloesin(organic chemistry) A derivative of aloe vera.alphorn(music) A long, curved, wooden horn used by mountain-dwelling herders in the Alps, originally to call cattle but now only as musical instrument in classical and folk tunes.altcoin(cryptocurrencies) A cryptocurrency other than bitcoin.althorn(music) An alto or tenor saxhornalumian(mineralogy) natroaluniteamadawnAlternative form of amadan.amastin(biochemistry) A transmembrane glycoprotein found in trypanosomatid parasitesambreinA fragrant substance (a triterpenoid alcohol) derived from ambergris, used in the perfume industry.amebeanAlternative spelling of amoebean.amoebanAlternative spelling of ameban.amotionremoval; oustinganalgenAlternative form of analgene.anascan(zoology, obsolete) Any member of the Anasca suborder of bryozoans.anation(physical chemistry) The replacement of a ligand (especially of water) by an anion in a coordination compoundanatman(Hinduism) That which is other than the atman (self), such as the body.anatron(obsolete) native carbonate of soda; natronanderun(historical) The harem of the royal household of the shah of Persia.andiron(usually in the plural) A utensil for supporting wood when burning in a fireplace, one being placed on each sideaneugen(genetics) An aneugenic agent.aneurinArchaic form of aneurine.angulin(biochemistry) Any of a group of tight junction proteins associated with the blood-brain barrieranillinA conserved protein implicated in cytoskeletal dynamics during cellularization and cytokinesis.ankryinMisspelling of ankyrin.ankyrin(biology) Any of a family of adaptor proteins that mediate the attachment of integral membrane proteins to the spectrin-actin based membrane skeleton.anlagenplural of anlageannexin(biology) Any of a group of cellular proteins found in all kingdoms (animal, plant and fungi) with the exception of the bacteria.annoninAn active ingredient present in extracts of seed kernels of the genus Annona, used as an insecticide.antibanIn opposition to a ban.antidin(medicine) Any of a group of drugs (such as avidins) that bind tightly to biotinantigen(immunology) A substance that induces an immune response, usually foreign (nonself) but not always so.antigunOpposed to guns, especially widespread individual use of guns.antimanOpposed to men.antimenAlternative form of antiman.antisun(astrophysics, countable) A hypothetical sun composed of antimatter.antlionAny of various species of insects, many of them nocturnal, in the family Myrmeleontidae. The adults superficially resemble the unrelated damselflies. The larvae bury themselves in sand below a cone-shaped pit in which they trap insects such as ants.antwrenAny member of a genus of small antbirds, Myrmotherula.anywhen(rare, nonstandard) whenever, at any point in timeapeironA kind of infinite primal chaos in the cosmological theory of Anaximander.apogeanConnected with the apogee.apokron(rare) Alternative form of apokrone.apopain(biochemistry) An enzyme that catalyzes the proteolytic degradation of PARPapoptin(biochemistry) A short, nonstructural viral protein encoded by Chicken anemia virus.apteran(zoology) Any of the Aptera, an obsolete taxonomic category of wingless arthropods.apterin(organic chemistry, biochemistry) A furanocoumarin, the glucoside of vaginol, found in Zizia aptera and other plants.arachin(organic chemistry) The triglyceride of arachidic acidaration(obsolete, agriculture) ploughing, tillagearbacin(organic chemistry) A substance prepared from the sea urchin of genus Arbacia.arbutin(organic chemistry) A glycoside of hydroquinone, found in bearberry, that is used to treat some diseases of the urinary tractarcheenAlternative form of arshin.archeonAlternative spelling of archaeon.archsinA chief or primary sin.arctiinA lignan, present in plants of the genus Arctium, that is a glucoside of arctigeninargamanAn Israeli wine grape.argifin(biochemistry) A cyclopentapeptide, produced by species of genus Gliocephalis (syn. Gliocladium), that inhibits chitinases.argyrin(medicine) Any of a class of antitumour drugs obtained from myxobacteriaarmspanAlternative form of arm span.armymanA member of a Chinese Communist army.arnicin(organic chemistry) A bitter resin that is an active principle of wolfsbane (Arnica montana).arraign(with on, (archaic) for) To officially charge someone in a court of law.arschinAlternative form of arshin.arsheenAlternative form of arshine.artemin(biochemistry) A neurotrophin, or nerve growth factor, in the GDNF family, bonding to the receptor GFRalpha3-RET.artemon(historical) A square foresail on a Roman oared ship.arthronAn articulation or joint.artisanA skilled manual worker who uses tools and machinery in a particular craft.artizanArchaic spelling of artisan.artsman(obsolete) A man skilled in an art or in arts.asbolin(organic chemistry) An acrid oil obtained from wood soot.asperinA particular steroid glycoside.aspidinA spongy bonelike material that made up the skin of the jawless fish Astraspisaspirin(uncountable, organic chemistry, pharmacology) an analgesic drug, acetylsalicylic acidasporin(biochemistry) A protein similar to decorinassapan(Southern US, now uncommon) A southern flying squirrel (Glaucomys volans), found in the southern and eastern United States.assicon(Internet slang) An emoticon that takes the form of buttocks.astacin(organic chemistry) astaxanthinastasinA particular steroid glycoside.asteron(cytology) An astrocyte / neuron hybrid cellastexin(biochemistry) Any of a family of heat-sensitive lasso peptidesastrainstrained or strainingastrionSynonym of astroite.asudden(poetic or dialect) of a sudden; suddenlyatebrinA preparation of the drug quinacrine, formerly used as an antimalarial.atophan(organic chemistry, pharmacology) Synonym of cinchophen (“analgesic drug”).atrogin(biochemistry) Any of a family of F-box proteins expressed during muscle atrophyatropinAlternative spelling of atropine.attacin(biochemistry) An antibacterial protein originally found in the immune haemolymph of Hyalophora cecropiaattagen(obsolete) A grey partridge (Perdix perdix) of Eurasia.attamanAlternative form of ataman.auctionA public event where goods or property are sold to the highest bidder.aucubin(organic chemistry) An iridoid glycoside found in asterids such as Aucuba japonica.autoion(rare, physics) An ion which has been formed by autoionizationautoman(dated) A man involved in automobile manufacture.autopenA machine that automatically writes a person's signature.autoransimple past of autorunautorun(computing) Any feature that runs a program, etc. automatically.avertin(pharmacology, organic chemistry) Synonym of tribromoethanol.avialanAny animal belonging to the clade Avialae, including all birds and various groups of closely related dinosaursavision(obsolete) A vision of a prophetic or admonitory nature.avornin(organic chemistry) Synonym of frangulin.axlepinSynonym of linchpin.azafrinAn orange pigment with chemical formula C₂₇H₃₈O₄, found in azafranillo root (Escobedia scabrifolia).azalein(organic chemistry) A flavonol 2-(3,4-dihydroxyphenyl)-7-hydroxy-5-methoxy-3-[(2S,3R,4R,5R,6S)-3,4,5-trihydroxy-6-methyloxan-2-yl]oxychromen-4-oneazureanOf a fine blue color; azure.