| aardvark | (noun) nocturnal burrowing mammal of the grasslands of Africa that feeds on termites; sole extant representative of the order Tubulidentata | Synonyms: ant bear, anteater, Orycteropus afer |
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| aardwolf | (noun) striped hyena of southeast Africa that feeds chiefly on insects | Synonyms: Proteles cristata |
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| abarticulation | (noun) dislocation of a joint | - |
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| abecedarian | (adjective) alphabetically arranged (as for beginning readers) | - |
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| (noun) a novice learning the rudiments of some subject | - |
| abecedarius | (noun) a poem having lines beginning with letters of the alphabet in regular order | - |
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| abfarad | (noun) a capacitance unit equal to one billion farads | - |
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| ablepharia | (noun) a congenital absence of eyelids (partial or complete) | - |
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| ablutionary | (adjective) cleansing the body by washing; especially ritual washing of e.g. hands | Synonyms: cleansing |
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| aboard | (adverb) on first or second or third base | - |
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| (adverb) on a ship, train, plane or other vehicle | Synonyms: on board |
| (adverb) part of a group | - |
| (adverb) side by side | Synonyms: alongside |
| abolitionary | (adjective) relating to or favoring abolition, especially abolition of slavery | - |
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| aboveboard | (adjective) without concealment or deception; honest | Synonyms: straightforward |
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| (adverb) in an honest manner | Synonyms: honestly |
| acaracide | (noun) a chemical agent used to kill mites | Synonyms: acaricide |
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| acardia | (noun) congenital absence of the heart (as in the development of some monsters) | - |
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| acariasis | (noun) infestation with itch mites | Synonyms: acaridiasis, acariosis |
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| acaricide | (noun) a chemical agent used to kill mites | Synonyms: acaracide |
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| acarid | (noun) very small free-living arachnid that is parasitic on animals or plants; related to ticks | - |
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| acaridiasis | (noun) infestation with itch mites | Synonyms: acariasis, acariosis |
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| acarine | (noun) mite or tick | - |
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| acariosis | (noun) infestation with itch mites | Synonyms: acariasis, acaridiasis |
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| acarophobia | (noun) a morbid fear of small insects and mites and worms | - |
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| acarpellous | (adjective) having no carpels | Synonyms: acarpelous |
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| acarpelous | (adjective) having no carpels | Synonyms: acarpellous |
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| acarpous | (adjective) producing no fruit | - |
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| acarus | (noun) any of several mites of the order Acarina | Synonyms: genus Acarus |
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| acaryote | (noun) a cell without a nucleus (as an erythrocyte) | Synonyms: akaryocyte, akaryote |
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| accessary | (adjective) aiding and abetting in a crime | Synonyms: accessory |
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| (noun) someone who helps another person commit a crime | Synonyms: accessory |
| accretionary | (adjective) marked or produced by accretion | - |
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| acellular | (adjective) not made up of or divided into cells | Synonyms: noncellular |
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| acetabular | (adjective) of the cup-shaped socket that receives the head of the thigh bone | Synonyms: cotyloid, cotyloidal |
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| acicular | (adjective) narrow and long and pointed; as pine leaves | Synonyms: acerate, acerose, needle-shaped |
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| acinar | (adjective) pertaining to the individual parts making up an aggregate fruit like a blackberry | - |
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| (adjective) pertaining to one of the small sacs (as in a compound gland) | Synonyms: acinic, acinose, acinous |
| acrocarp | (noun) a moss in which the main axis is terminated by the archegonium (and hence the capsule) | Synonyms: acrocarpous moss |
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| acrocarpous | (adjective) (of mosses) having the archegonia at the top of the stem | - |
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| actiniarian | (noun) any sea anemone or related animal | Synonyms: actinia, actinian |
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| activewear | (noun) attire worn for sport or for casual wear | Synonyms: athletic wear, sportswear |
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| actuarial | (adjective) of or relating to the work of an actuary | - |
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| actuary | (noun) someone versed in the collection and interpretation of numerical data (especially someone who uses statistics to calculate insurance premiums) | Synonyms: statistician |
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| adenocarcinoma | (noun) malignant tumor originating in glandular epithelium | Synonyms: glandular cancer, glandular carcinoma |
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| adenocarcinomatous | (adjective) of or pertaining to adenocarcinoma | - |
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| adenomyosarcoma | (noun) malignant renal tumor of young children characterized by hypertension and blood in the urine and the presence of a palpable mass | Synonyms: embryoma of the kidney, nephroblastoma, Wilms' tumor, Wilms tumour |
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| adrenarche | (noun) the increase in activity of the adrenal glands just before puberty | - |
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| adversary | (noun) someone who offers opposition | Synonyms: antagonist, opponent, opposer, resister |
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| afar | (adverb) (old-fashioned) at or from or to a great distance; far | - |
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| afeard | (adjective) a pronunciation of afraid | Synonyms: afeared |
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| afeared | (adjective) a pronunciation of afraid | Synonyms: afeard |
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| aflare | (adjective) lighted up by or as by fire or flame | Synonyms: ablaze, afire, aflame, alight, on fire |
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| (adjective) streaming or flapping or spreading wide as if in a current of air | Synonyms: flaring |
| aftercare | (noun) care and treatment of a convalescent patient | - |
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| afterward | (adverb) happening at a time subsequent to a reference time | Synonyms: after, afterwards, later, later on, subsequently |
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| afterwards | (adverb) happening at a time subsequent to a reference time | Synonyms: after, afterward, later, later on, subsequently |
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| agar | (noun) a colloidal extract of algae; used especially in culture media and as a gelling agent in foods | Synonyms: agar-agar |
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| (noun) any culture medium that uses agar as the gelling agent | Synonyms: nutrient agar |
| agaric | (noun) a saprophytic fungus of the order Agaricales having an umbrellalike cap with gills on the underside | - |
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| (noun) fungus used in the preparation of punk for fuses | Synonyms: Fomes igniarius |
| agateware | (noun) pottery that is veined and mottled to resemble agate | - |
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| agrarian | (adjective) relating to farming or agriculture | Synonyms: agricultural, farming |
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| airfare | (noun) the fare charged for traveling by airplane | - |
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| ajar | (adjective) slightly open | - |
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| 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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| alar | (adjective) of or relating to the axil | Synonyms: axillary |
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| (adjective) having or resembling wings | Synonyms: alary, aliform, wing-shaped |
| alarm | (noun) a device that signals the occurrence of some undesirable event | Synonyms: alarm system, warning device |
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| (noun) a clock that wakes a sleeper at some preset time | Synonyms: alarm clock |
| (noun) an automatic signal (usually a sound) warning of danger | Synonyms: alarum, alert, warning signal |
| (noun) fear resulting from the awareness of danger | Synonyms: consternation, dismay |
| (verb) warn or arouse to a sense of danger or call to a state of preparedness | Synonyms: alert |
| (verb) fill with apprehension or alarm; cause to be unpleasantly surprised | Synonyms: appal, appall, dismay, horrify |
| alarmed | (adjective) experiencing a sudden sense of danger | - |
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| alarming | (adjective) frightening because of an awareness of danger | - |
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| alarmingly | (adverb) in an alarming manner | - |
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| alarmism | (noun) needless warnings | - |
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| alarmist | (noun) a person who alarms others needlessly | - |
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| alarum | (noun) an automatic signal (usually a sound) warning of danger | Synonyms: alarm, alert, warning signal |
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| alary | (adjective) having or resembling wings | Synonyms: alar, aliform, wing-shaped |
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| alcazar | (noun) any of various Spanish fortresses or palaces built by the Moors | - |
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| alfilaria | (noun) European weed naturalized in southwestern United States and Mexico having reddish decumbent stems with small fernlike leaves and small deep reddish-lavender flowers followed by slender fruits that stick straight up; often grown for forage | Synonyms: alfileria, clocks, Erodium cicutarium, filaree, filaria, pin clover, pin grass, redstem storksbill |
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| algarobilla | (noun) mesquite pod used in tanning and dyeing | Synonyms: algarroba, algarrobilla |
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| algarroba | (noun) evergreen Mediterranean tree with edible pods; the biblical carob | Synonyms: carob, carob bean tree, carob tree, Ceratonia siliqua |
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| (noun) mesquite of Gulf Coast and Caribbean Islands from Mexico to Venezuela | Synonyms: Prosopis juliflora, Prosopis juliiflora |
| (noun) long pod containing small beans and sweetish edible pulp; used as animal feed and source of a chocolate substitute | Synonyms: algarroba bean, carob, carob bean, locust bean, locust pod |
| (noun) mesquite pod used in tanning and dyeing | Synonyms: algarobilla, algarrobilla |
| algarrobilla | (noun) mesquite pod used in tanning and dyeing | Synonyms: algarobilla, algarroba |
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| alimentary | (adjective) of or providing nourishment | Synonyms: alimental, nourishing, nutrient, nutritious, nutritive |
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| alizarin | (noun) an orange-red crystalline compound used in making red pigments and in dyeing | Synonyms: alizarine |
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| alizarine | (noun) an orange-red crystalline compound used in making red pigments and in dyeing | Synonyms: alizarin |
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| allargando | (adjective) (music) gradually decreasing in tempo and broadening in manner | - |
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| altar | (noun) a raised structure on which gifts or sacrifices to a god are made | - |
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| (noun) the table in Christian churches where communion is given | Synonyms: communion table, Lord's table |
| altarpiece | (noun) a painted or carved screen placed above and behind an altar or communion table | Synonyms: reredos |
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| alular | (adjective) pertaining to alulae | - |
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| alveolar | (adjective) pertaining to the tiny air sacs of the lungs | - |
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| (adjective) pertaining to the sockets of the teeth or that part of the upper jaw | - |
| (noun) a consonant articulated with the tip of the tongue near the gum ridge | Synonyms: alveolar consonant, dental, dental consonant |
| amaranth | (noun) any of various plants of the genus Amaranthus having dense plumes of green or red flowers; often cultivated for food | - |
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| (noun) seed of amaranth plants used as a native cereal in Central and South America | - |
| amaranthine | (adjective) of or related to the amaranth plant | - |
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| (adjective) of an imaginary flower that never fades | Synonyms: unfading |
| amarelle | (noun) pale red sour cherry with colorless or nearly colorless juice | - |
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| (noun) any of several cultivated sour cherry trees bearing pale red fruit with colorless juice | Synonyms: Prunus cerasus caproniana |
| amaretto | (noun) an Italian almond liqueur | - |
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| amaryllis | (noun) bulbous plant having showy white to reddish flowers | - |
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| amiodarone | (noun) an antiarrhythmic drug (trade name Cordarone) that has potentially fatal side effects and is used to control serious heart rhythm problems only when safer agents have been ineffective | Synonyms: Cordarone |
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| amobarbital | (noun) a barbiturate with sedative and hypnotic effects; used to relieve insomnia and as an anticonvulsant | - |
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| amphiprostylar | (adjective) marked by columniation having free columns in porticoes either at both ends or at both sides of a structure | Synonyms: amphiprostyle, amphistylar, porticoed |
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| amphistylar | (adjective) marked by columniation having free columns in porticoes either at both ends or at both sides of a structure | Synonyms: amphiprostylar, amphiprostyle, porticoed |
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| (adjective) having columns either at both ends or at both sides | - |
| ampullar | (adjective) of or related to an ampulla | Synonyms: ampullary |
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| ampullary | (adjective) of or related to an ampulla | Synonyms: ampullar |
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| anarchic | (adjective) without law or control | Synonyms: anarchical, lawless |
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| anarchical | (adjective) without law or control | Synonyms: anarchic, lawless |
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| anarchically | (adverb) in a lawless rebellious manner | - |
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| anarchism | (noun) a political theory favoring the abolition of governments | - |
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| anarchist | (noun) an advocate of anarchism | Synonyms: nihilist, syndicalist |
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| anarchistic | (adjective) of or related to anarchism or tending toward anarchism | - |
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| anarchy | (noun) a state of lawlessness and disorder (usually resulting from a failure of government) | Synonyms: lawlessness |
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| anarthria | (noun) partial or total loss of articulate speech resulting from lesions of the central nervous system | - |
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| anasarca | (noun) generalized edema with accumulation of serum in subcutaneous connective tissue | - |
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| anasarcous | (adjective) characterized by or affected by dropsy | - |
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