| abiogenist | (noun) a believer in abiogenesis | - |
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| abolitionism | (noun) the doctrine that calls for the abolition of slavery | - |
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| abolitionist | (noun) a reformer who favors abolishing slavery | Synonyms: emancipationist |
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| abortionist | (noun) a person (who should be a doctor) who terminates pregnancies | - |
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| abstractionism | (noun) an abstract genre of art; artistic content depends on internal form rather than pictorial representation | Synonyms: abstract art |
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| (noun) a representation having no reference to concrete objects or specific examples | Synonyms: unrealism |
| abstractionist | (noun) a painter of abstract pictures | Synonyms: abstract artist |
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| acapnia | (noun) a state in which the level of carbon dioxide in the blood is lower than normal; can result from deep or rapid breathing | Synonyms: hypocapnia |
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| accompaniment | (noun) the act of accompanying someone or something in order to protect them | Synonyms: escort |
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| (noun) something added to complete or embellish or make perfect | Synonyms: complement |
| (noun) a musical part (vocal or instrumental) that supports or provides background for other musical parts | Synonyms: backup, musical accompaniment, support |
| (noun) an event or situation that happens at the same time as or in connection with another | Synonyms: attendant, co-occurrence, concomitant |
| accompanist | (noun) a person who provides musical accompaniment (usually on a piano) | Synonyms: accompanyist |
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| accordionist | (noun) a musician who plays the accordion | - |
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| acetanilid | (noun) a solid odourless chemical of leaf or flake-like appearance; used in rubber accelerator, dye, and camphor synthesis; metabolised to paracetamol (acetaminophen) | Synonyms: acetanilide, phenylacetamide |
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| acetanilide | (noun) a solid odourless chemical of leaf or flake-like appearance; used in rubber accelerator, dye, and camphor synthesis; metabolised to paracetamol (acetaminophen) | Synonyms: acetanilid, phenylacetamide |
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| aconite | (noun) any of various usually poisonous plants of the genus Aconitum having tuberous roots and palmately lobed leaves and blue or white flowers | - |
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| acromyotonia | (noun) myotonia of the extremities only; causes spastic deformity of the hand or foot | - |
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| acrylonitrile | (noun) a colorless liquid unsaturated nitrile made from propene | Synonyms: propenonitrile, vinyl cyanide |
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| actinia | (noun) any sea anemone or related animal | Synonyms: actinian, actiniarian |
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| actinian | (noun) any sea anemone or related animal | Synonyms: actinia, actiniarian |
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| actiniarian | (noun) any sea anemone or related animal | Synonyms: actinia, actinian |
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| actinide | (noun) any of a series of radioactive elements with atomic numbers 89 through 103 | Synonyms: actinoid, actinon |
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| actinism | (noun) the property of radiation that enables it to produce photochemical effects | - |
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| actinium | (noun) a radioactive element of the actinide series; found in uranium ores | Synonyms: Ac, atomic number 89 |
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| adenine | (noun) (biochemistry) purine base found in DNA and RNA; pairs with thymine in DNA and with uracil in RNA | Synonyms: A |
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| adenitis | (noun) inflammation of a gland or lymph node | - |
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| administration | (noun) a method of tending to or managing the affairs of some group of people (especially the group's business affairs) | Synonyms: disposal |
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| (noun) the act of administering medication | Synonyms: giving medication |
| (noun) the act of meting out justice according to the law | Synonyms: judicature |
| (noun) the act of governing; exercising authority | Synonyms: governance, governing, government, government activity |
| (noun) the persons (or committees or departments etc.) who make up a body for the purpose of administering something | Synonyms: brass, establishment, governance, governing body, organisation, organization |
| (noun) the tenure of a president | Synonyms: presidency, presidential term |
| administrator | (noun) someone who administers a business | Synonyms: decision maker |
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| (noun) the party appointed by a probate court to distribute the estate of someone who dies without a will or without naming an executor | - |
| (noun) someone who manages a government agency or department | Synonyms: executive |
| administrivia | (noun) the tiresome but essential details that must be taken care of and tasks that must be performed in running an organization | - |
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| admonisher | (noun) someone who gives a warning so that a mistake can be avoided | Synonyms: monitor, reminder |
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| admonishment | (noun) a firm rebuke | Synonyms: admonition, monition |
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| admonition | (noun) a firm rebuke | Synonyms: admonishment, monition |
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| (noun) cautionary advice about something imminent (especially imminent danger or other unpleasantness) | Synonyms: monition, warning, word of advice |
| adonis | (noun) any handsome young man | - |
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| aepyornis | (noun) huge (to 9 ft.) extinct flightless bird of Madagascar | Synonyms: elephant bird |
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| aeromechanics | (noun) the branch of mechanics that deals with the motion of gases (especially air) and their effects on bodies in the flow | Synonyms: aerodynamics |
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| affinity | (noun) inherent resemblance between persons or things | - |
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| (noun) a natural attraction or feeling of kinship | - |
| (noun) the force attracting atoms to each other and binding them together in a molecule | Synonyms: chemical attraction |
| (noun) (immunology) the attraction between an antigen and an antibody | - |
| (noun) (anthropology) kinship by marriage or adoption; not a blood relationship | - |
| (noun) (biology) state of relationship between organisms or groups of organisms resulting in resemblance in structure or structural parts | Synonyms: phylogenetic relation |
| (noun) a close connection marked by community of interests or similarity in nature or character | Synonyms: kinship |
| afghani | (noun) the basic unit of money in Afghanistan | - |
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| agglutinin | (noun) an antibody that causes agglutination of a specific antigen | - |
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| agonist | (noun) (biochemistry) a drug that can combine with a receptor on a cell to produce a physiological reaction | - |
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| (noun) a muscle that contracts while another relaxes | - |
| (noun) someone involved in a contest or battle (as in an agon) | - |
| (noun) the principal character in a work of fiction | Synonyms: protagonist |
| agrimonia | (noun) a plant of the genus Agrimonia having spikelike clusters of small yellow flowers | Synonyms: agrimony |
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| agromania | (noun) an intense desire to be alone or out in the open | - |
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| agrypnia | (noun) a vigil before certain feasts (as e.g. Easter) | - |
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| alanine | (noun) a crystalline amino acid that occurs in many proteins | - |
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| albinism | (noun) the congenital absence of pigmentation in the eyes and skin and hair | - |
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| aldosteronism | (noun) a condition caused by overproduction of aldosterone | Synonyms: hyperaldosteronism |
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| algolagnia | (noun) sexual pleasure derived from inflicting or experiencing pain | Synonyms: algophilia |
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| alienism | (noun) the quality of being alien | Synonyms: alienage |
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| (noun) an obsolete term for the study and treatment of mental illness | - |
| alienist | (noun) a psychiatrist and specialist in the legal aspects of mental illness | - |
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| alkalinity | (noun) pH values above 7 | - |
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| alpinist | (noun) a mountain climber who specializes in difficult climbs | - |
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| aluminium | (noun) a silvery ductile metallic element found primarily in bauxite | Synonyms: Al, aluminum, atomic number 13 |
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| amblygonite | (noun) a white or grey mineral consisting of lithium aluminum phosphate; a source of lithium | - |
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| amenia | (noun) absence or suppression of normal menstrual flow | Synonyms: amenorrhea, amenorrhoea |
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| amenities | (noun) things that make you comfortable and at ease | Synonyms: comforts, conveniences, creature comforts |
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| amenity | (noun) pleasantness resulting from agreeable conditions | Synonyms: agreeableness |
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| ammonia | (noun) a pungent gas compounded of nitrogen and hydrogen (NH3) | - |
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| (noun) a water solution of ammonia | Synonyms: ammonia water, ammonium hydroxide |
| ammoniac | (noun) the aromatic gum of the ammoniac plant | Synonyms: gum ammoniac |
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| ammonification | (noun) impregnation with ammonia or a compound of ammonia | - |
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| ammonite | (noun) one of the coiled chambered fossil shells of extinct mollusks | Synonyms: ammonoid |
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| ammonium | (noun) the ion NH4 derived from ammonia; behaves in many respects like an alkali metal ion | Synonyms: ammonium ion |
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| ammoniuria | (noun) excessive ammonia in the urine | - |
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| ammunition | (noun) projectiles to be fired from a gun | Synonyms: ammo |
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| (noun) information that can be used to attack or defend a claim or argument or viewpoint | - |
| (noun) any nuclear or chemical or biological material that can be used as a weapon of mass destruction | - |
| amnio | (noun) (pregnancy) extraction by centesis of amniotic fluid from a pregnant woman (after the 15th week of pregnancy) to aid in the diagnosis of fetal abnormalities | Synonyms: amniocentesis |
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| amniocentesis | (noun) (pregnancy) extraction by centesis of amniotic fluid from a pregnant woman (after the 15th week of pregnancy) to aid in the diagnosis of fetal abnormalities | Synonyms: amnio |
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| amnion | (noun) thin innermost membranous sac enclosing the developing embryo of higher vertebrates (reptiles, birds and mammals) | Synonyms: amnios, amniotic sac |
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| amnios | (noun) thin innermost membranous sac enclosing the developing embryo of higher vertebrates (reptiles, birds and mammals) | Synonyms: amnion, amniotic sac |
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| amniote | (noun) any member of the Amniota | - |
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| amyotonia | (noun) lack of normal muscular tension or tonus | Synonyms: atonia, atonicity, atony |
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| anachronism | (noun) an artifact that belongs to another time | - |
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| (noun) a person who seems to be displaced in time; who belongs to another age | - |
| (noun) something located at a time when it could not have existed or occurred | Synonyms: misdating, mistiming |
| andrenid | (noun) a bee that is a member of the genus Andrena | Synonyms: andrena, mining bee |
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| angiotonin | (noun) any of several vasoconstrictor substances (trade name Hypertensin) that cause narrowing of blood vessels | Synonyms: angiotensin, Hypertensin |
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| anhedonia | (noun) an inability to experience pleasure | - |
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| ani | (noun) black tropical American cuckoo | - |
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| anil | (noun) shrub of West Indies and South America that is a source of indigo dye | Synonyms: Indigofera anil, Indigofera suffruticosa |
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| (noun) a blue dye obtained from plants or made synthetically | Synonyms: indigo, indigotin |
| aniline | (noun) oily poisonous liquid amine obtained from nitrobenzene and used to make dyes and plastics and medicines | Synonyms: aminobenzine, aniline oil, phenylamine |
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| anima | (noun) (Jungian psychology) the inner self (not the external persona) that is in touch with the unconscious | - |
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| animadversion | (noun) harsh criticism or disapproval | Synonyms: censure |
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| animal | (noun) a living organism characterized by voluntary movement | Synonyms: animate being, beast, brute, creature, fauna |
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| animalcule | (noun) microscopic organism such as an amoeba or paramecium | Synonyms: animalculum |
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| animalculum | (noun) microscopic organism such as an amoeba or paramecium | Synonyms: animalcule |
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| animalisation | (noun) an act that makes people cruel or lacking normal human qualities | Synonyms: animalization, brutalisation, brutalization |
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| animalism | (noun) preoccupation with satisfaction of physical drives and appetites | Synonyms: physicality |
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| (noun) the doctrine that human beings are purely animal in nature and lacking a spiritual nature | - |
| animality | (noun) the physical (or animal) side of a person as opposed to the spirit or intellect | Synonyms: animal nature |
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| animalization | (noun) an act that makes people cruel or lacking normal human qualities | Synonyms: animalisation, brutalisation, brutalization |
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| (noun) a depiction in the form of an animal | - |
| animateness | (noun) the property of being animated; having animal life as distinguished from plant life | Synonyms: aliveness, liveness |
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| animation | (noun) the making of animated cartoons | - |
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| (noun) general activity and motion | Synonyms: liveliness |
| (noun) the activity of giving vitality and vigour to something | Synonyms: invigoration, vivification |
| (noun) the property of being able to survive and grow | Synonyms: vitality |
| (noun) quality of being active or spirited or alive and vigorous | Synonyms: brio, invigoration, spiritedness, vivification |
| (noun) the condition of living or the state of being alive | Synonyms: aliveness, life, living |
| animatism | (noun) the attribution of consciousness and personality to natural phenomena such as thunderstorms and earthquakes and to objects such as plants and stones | - |
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| animator | (noun) the technician who produces animated cartoons | - |
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| (noun) someone who imparts energy and vitality and spirit to other people | Synonyms: energiser, energizer, vitaliser, vitalizer |
| animatronics | (noun) the construction of robots to look like animals (developed for Disneyland) | - |
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| anime | (noun) a style of animation developed in Japan, characterized by stylized colorful art and often adult themes | - |
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| (noun) a hard copal derived from an African tree | Synonyms: Zanzibar copal |
| (noun) any of various resins or oleoresins | Synonyms: gum anime |
| animism | (noun) the doctrine that all natural objects and the universe itself have souls | - |
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| animist | (noun) one who accepts the doctrine of animism | - |
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| animosity | (noun) a feeling of ill will arousing active hostility | Synonyms: animus, bad blood |
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| animus | (noun) a feeling of ill will arousing active hostility | Synonyms: animosity, bad blood |
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| anion | (noun) a negatively charged ion | - |
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| anionic | (noun) a class of synthetic detergents in which the molecules do not ionize in aqueous solutions | Synonyms: anionic detergent, non-ionic detergent |
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| anise | (noun) liquorice-flavored seeds, used medicinally and in cooking and liquors | Synonyms: anise seed, aniseed |
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| (noun) native to Egypt but cultivated widely for its aromatic seeds and the oil from them used medicinally and as a flavoring in cookery | Synonyms: anise plant, Pimpinella anisum |
| aniseed | (noun) liquorice-flavored seeds, used medicinally and in cooking and liquors | Synonyms: anise, anise seed |
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| aniseikonia | (noun) visual defect in which the shape and size of an ocular image differ in the two eyes | - |
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| anisette | (noun) liquorice-flavored usually colorless sweet liqueur made from aniseed | Synonyms: anisette de Bordeaux |
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| anisogamete | (noun) either of a pair of unlike gametes especially those unlike in size | - |
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| anisogamy | (noun) (biology) reproduction by the union or fusion of two differing gametes (especially differing in size) | - |
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| anisometropia | (noun) difference in the refractive power of the two eyes | - |
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