| advisability | (noun) the quality of being advisable | - |
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| advisory | (noun) an announcement that usually advises or warns the public of some threat | - |
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| advocacy | (noun) active support of an idea or cause etc.; especially the act of pleading or arguing for something | Synonyms: protagonism |
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| adynamia | (noun) lack of strength or vigor (especially from illness) | - |
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| aepyornis | (noun) huge (to 9 ft.) extinct flightless bird of Madagascar | Synonyms: elephant bird |
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| aerodynamics | (noun) the branch of mechanics that deals with the motion of gases (especially air) and their effects on bodies in the flow | Synonyms: aeromechanics |
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| aerology | (noun) meteorology of the total extent of the atmosphere; especially the upper layers | - |
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| aerophilately | (noun) the collection and study of airmail stamps | - |
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| aerophyte | (noun) plant that derives moisture and nutrients from the air and rain; usually grows on another plant but not parasitic on it | Synonyms: air plant, epiphyte, epiphytic plant |
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| aery | (noun) any habitation at a high altitude | Synonyms: aerie, eyrie, eyry |
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| (noun) the lofty nest of a bird of prey (such as a hawk or eagle) | Synonyms: aerie, eyrie, eyry |
| aeschynanthus | (noun) a plant of the genus Aeschynanthus having somewhat red or orange flowers and seeds having distinctive hairs at base and apex | - |
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| aetiology | (noun) the philosophical study of causation | Synonyms: etiology |
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| (noun) the cause of a disease | Synonyms: etiology |
| affability | (noun) a disposition to be friendly and approachable (easy to talk to) | Synonyms: affableness, amiability, amiableness, bonhomie, geniality |
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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 |
| affray | (noun) a noisy fight | Synonyms: disturbance, fray, ruffle |
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| (noun) noisy quarrel | Synonyms: altercation, fracas |
| agency | (noun) to have the ability to produce a particular effect or achieve an end | Synonyms: means, way |
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| (noun) an administrative unit of government | Synonyms: authority, bureau, federal agency, government agency, office |
| (noun) a business or organization that provides a particular service, especially the mediation of transactions between two parties | - |
| (noun) the state of serving as an official and authorized delegate or agent | Synonyms: delegacy, representation |
| (noun) the state of being in action or exerting power | - |
| agility | (noun) the gracefulness of a person or animal that is quick and nimble | Synonyms: legerity, lightness, lightsomeness, nimbleness |
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| agony | (noun) intense feelings of suffering; acute mental or physical pain | Synonyms: torment, torture |
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| (noun) a state of acute pain | Synonyms: excruciation, suffering |
| agranulocytosis | (noun) an acute blood disorder (often caused by radiation or drug therapy) characterized by severe reduction in granulocytes | Synonyms: agranulosis, granulocytopenia |
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| agreeability | (noun) a temperamental disposition to be agreeable | Synonyms: agreeableness |
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| agrimony | (noun) a plant of the genus Agrimonia having spikelike clusters of small yellow flowers | Synonyms: agrimonia |
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| agrobiology | (noun) the study of plant nutrition and growth especially as a way to increase crop yield | - |
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| agrology | (noun) science of soils in relation to crops | - |
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| agronomy | (noun) the application of soil and plant sciences to land management and crop production | Synonyms: scientific agriculture |
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| agrypnia | (noun) a vigil before certain feasts (as e.g. Easter) | - |
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| airway | (noun) a commercial enterprise that provides scheduled flights for passengers | Synonyms: airline, airline business |
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| (noun) a duct that provides ventilation (as in mines) | Synonyms: air duct, air passage |
| (noun) the passages through which air enters and leaves the body | Synonyms: respiratory tract |
| (noun) a designated route followed by airplanes in flying from one airport to another | Synonyms: air lane, flight path, skyway |
| akaryocyte | (noun) a cell without a nucleus (as an erythrocyte) | Synonyms: acaryote, akaryote |
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| akaryote | (noun) a cell without a nucleus (as an erythrocyte) | Synonyms: acaryote, akaryocyte |
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| alacrity | (noun) liveliness and eagerness | Synonyms: briskness, smartness |
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| alchemy | (noun) a pseudoscientific forerunner of chemistry in medieval times | - |
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| (noun) the way two individuals relate to each other | Synonyms: chemistry, interpersonal chemistry |
| aldehyde | (noun) any of a class of highly reactive chemical compounds; used in making resins and dyes and organic acids | - |
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| alderfly | (noun) dark-colored insect having predaceous aquatic larvae | Synonyms: alder fly, Sialis lutaria |
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| algidity | (noun) prostration characterized by cold and clammy skin and low blood pressure | - |
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| algology | (noun) the branch of botany that studies algae | Synonyms: phycology |
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| algometry | (noun) measuring sensitivity to pain or pressure | - |
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| alimony | (noun) court-ordered support paid by one spouse to another after they are separated | Synonyms: maintenance |
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| aliyah | (noun) (Judaism) immigration of Jews to Israel | - |
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| (noun) (Judaism) the honor of being called up to the reading desk in the synagogue to read from the Torah | - |
| alkalimetry | (noun) volumetric analysis using standard solutions of alkali to measure the amount of acid present | - |
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| alkalinity | (noun) pH values above 7 | - |
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| alky | (noun) a person who drinks alcohol to excess habitually | Synonyms: alcoholic, boozer, dipsomaniac, lush, soaker, souse |
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| alkyd | (noun) a durable synthetic resin widely used in adhesives and paints | Synonyms: alkyd resin |
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| alkyl | (noun) any of a series of univalent groups of the general formula CnH2n+1 derived from aliphatic hydrocarbons | Synonyms: alkyl group, alkyl radical |
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| alkylbenzene | (noun) organic compound that has an alkyl group bound to a benzene ring | - |
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| alkylbenzenesulfonate | (noun) sulfonate of alkyl benzene | - |
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| alkyne | (noun) a colorless flammable gas used chiefly in welding and in organic synthesis | Synonyms: acetylene, ethyne |
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| allayer | (noun) a person who reduces the intensity (e.g., of fears) and calms and pacifies | Synonyms: comforter, reliever |
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| allegory | (noun) a short moral story (often with animal characters) | Synonyms: apologue, fable, parable |
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| (noun) an expressive style that uses fictional characters and events to describe some subject by suggestive resemblances; an extended metaphor | - |
| (noun) a visible symbol representing an abstract idea | Synonyms: emblem |
| allergology | (noun) the branch of medical science that studies the causes and treatment of allergies | - |
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| allergy | (noun) hypersensitivity reaction to a particular allergen; symptoms can vary greatly in intensity | Synonyms: allergic reaction |
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| alley | (noun) a narrow street with walls on both sides | Synonyms: alleyway, back street |
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| (noun) a lane down which a bowling ball is rolled toward pins | Synonyms: bowling alley, skittle alley |
| alleyway | (noun) a narrow street with walls on both sides | Synonyms: alley, back street |
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| alloantibody | (noun) an antibody that occurs naturally against foreign tissues from a person of the same species | Synonyms: isoantibody |
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| allogamy | (noun) cross-fertilization in plants | - |
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| allometry | (noun) the study of the relative growth of a part of an organism in relation to the growth of the whole | - |
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| allopathy | (noun) the usual method of treating disease with remedies that produce effects differing from those produced by the disease itself | - |
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| allopatry | (noun) the occurrence of related organisms in separate geographical areas with no overlap | - |
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| allotropy | (noun) the phenomenon of an element existing in two or more physical forms | Synonyms: allotropism |
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| alloy | (noun) the state of impairing the quality or reducing the value of something | Synonyms: admixture |
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| (noun) a mixture containing two or more metallic elements or metallic and nonmetallic elements usually fused together or dissolving into each other when molten | Synonyms: metal |
| ally | (noun) a friendly nation | - |
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| (noun) an associate who provides cooperation or assistance | Synonyms: friend |
| allyl | (noun) the univalent unsaturated organic radical C3H5; derived from propylene | Synonyms: allyl group, allyl radical |
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| alterability | (noun) the quality of being alterable | - |
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| alyssum | (noun) any garden plant of the genus Alyssum having clusters of small yellow or white flowers | Synonyms: madwort |
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| amaryllis | (noun) bulbous plant having showy white to reddish flowers | - |
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| ambidexterity | (noun) the property of being equally skillful with each hand | Synonyms: ambidextrousness |
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| ambiguity | (noun) unclearness by virtue of having more than one meaning | Synonyms: equivocalness |
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| (noun) an expression whose meaning cannot be determined from its context | - |
| ambivalency | (noun) mixed feelings or emotions | Synonyms: ambivalence |
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| amblygonite | (noun) a white or grey mineral consisting of lithium aluminum phosphate; a source of lithium | - |
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| amblyopia | (noun) visual impairment without apparent organic pathology | - |
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| amboyna | (noun) tree native to southeastern Asia having reddish wood with a mottled or striped black grain | Synonyms: padauk, padouk, Pterocarpus indicus |
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| (noun) mottled curly-grained wood of Pterocarpus indicus | Synonyms: Andaman redwood |
| ambulatory | (noun) a covered walkway (as in a cloister) | - |
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| ambystomid | (noun) small to moderate-sized terrestrial or semiaquatic New World salamander | Synonyms: ambystomid salamander |
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| amenability | (noun) the trait of being cooperative | Synonyms: amenableness, cooperativeness |
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| amenity | (noun) pleasantness resulting from agreeable conditions | Synonyms: agreeableness |
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| amethyst | (noun) a transparent purple variety of quartz; used as a gemstone | - |
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| amiability | (noun) a disposition to be friendly and approachable (easy to talk to) | Synonyms: affability, affableness, amiableness, bonhomie, geniality |
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| (noun) a cheerful and agreeable mood | Synonyms: good humor, good humour, good temper |
| amicability | (noun) having a disposition characterized by warmth and friendliness | Synonyms: amicableness |
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| (noun) a disinclination to quarrel | Synonyms: amicableness |
| amidopyrine | (noun) a white crystalline substance used as an analgesic and antipyretic | Synonyms: aminopyrine |
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| aminophylline | (noun) a theophylline derivative that is used as a bronchodilator in the treatment of bronchial asthma, emphysema, and bronchitis | - |
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| aminopyrine | (noun) a white crystalline substance used as an analgesic and antipyretic | Synonyms: amidopyrine |
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| amitriptyline | (noun) a tricyclic antidepressant drug (trade name Elavil) with serious side effects; interacts with many other medications | Synonyms: amitriptyline hydrochloride, Elavil |
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| amity | (noun) a cordial disposition | Synonyms: cordiality |
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| (noun) a state of friendship and cordiality | - |
| amnesty | (noun) the formal act of liberating someone | Synonyms: free pardon, pardon |
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| (noun) a warrant granting release from punishment for an offense | Synonyms: pardon |
| (noun) a period during which offenders are exempt from punishment | - |
| amorality | (noun) the quality of being amoral | - |
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| amphibology | (noun) an ambiguous grammatical construction; e.g., `they are flying planes' can mean either that someone is flying planes or that something is flying planes | Synonyms: amphiboly |
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| amphiboly | (noun) an ambiguous grammatical construction; e.g., `they are flying planes' can mean either that someone is flying planes or that something is flying planes | Synonyms: amphibology |
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| amphictyony | (noun) an association of neighboring states or tribes in ancient Greece; established originally to defend a common religious center | - |
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| amphidiploidy | (noun) the condition of being amphidiploid | - |
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| amphigory | (noun) nonsensical writing (usually verse) | Synonyms: nonsense verse |
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| ampholyte | (noun) A substance that acts as a base or an acid, depending on the pH of the solution into which it is introduced. | Synonyms: amphoteric electrolyte |
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| amygdala | (noun) an almond-shaped neural structure in the anterior part of the temporal lobe of the cerebrum; intimately connected with the hypothalamus and the hippocampus and the cingulate gyrus; as part of the limbic system it plays an important role in motivation and emotional behavior | Synonyms: amygdaloid nucleus, corpus amygdaloideum |
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| amygdalin | (noun) a bitter cyanogenic glucoside extracted from the seeds of apricots and plums and bitter almonds | - |
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| amygdaloid | (noun) volcanic rock in which rounded cavities formed by expanding gas have subsequently become filled with mineral deposits | - |
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| amygdalotomy | (noun) psychosurgery in which amygdaloid fibers that mediate limbic system activity are severed (in cases of extreme uncontrollable violence) | - |
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| amyl | (noun) a hydrocarbon radical that occurs in many organic compounds | - |
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| amylase | (noun) any of a group of proteins found in saliva and pancreatic juice and parts of plants; help convert starch to sugar | - |
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| amyloid | (noun) (pathology) a waxy translucent complex protein resembling starch that results from degeneration of tissue | - |
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| (noun) a non-nitrogenous food substance consisting chiefly of starch; any substance resembling starch | - |
| amyloidosis | (noun) a disorder characterized by deposit of amyloid in organs or tissues; often secondary to chronic rheumatoid arthritis or tuberculosis or multiple myeloma | - |
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| amylolysis | (noun) conversion of starch to sugar | - |
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| amylum | (noun) a complex carbohydrate found chiefly in seeds, fruits, tubers, roots and stem pith of plants, notably in corn, potatoes, wheat, and rice; an important foodstuff and used otherwise especially in adhesives and as fillers and stiffeners for paper and textiles | Synonyms: starch |
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| amyotonia | (noun) lack of normal muscular tension or tonus | Synonyms: atonia, atonicity, atony |
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