| 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 | (noun) a novice learning the rudiments of some subject | - |
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| 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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| 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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| 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 | (noun) someone who helps another person commit a crime | Synonyms: accessory |
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| 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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| 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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| 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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| 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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| aftercare | (noun) care and treatment of a convalescent patient | - |
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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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| airfare | (noun) the fare charged for traveling by airplane | - |
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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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| 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 |
| 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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| 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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| 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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| 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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| alveolar | (noun) a consonant articulated with the tip of the tongue near the gum ridge | Synonyms: alveolar consonant, dental, dental consonant |
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| 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 | - |
| 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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| 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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| 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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| angiocardiogram | (noun) a series of X rays representing the action of the heart and its blood vessels after the injection of a radiopaque substance | - |
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| angiocarp | (noun) tree bearing fruit enclosed in a shell or involucre or husk | - |
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| angiosarcoma | (noun) a rare malignant neoplasm arising from vascular tissue; usually occurs in the breast and skin and is believed to originate from the endothelial cells of blood vessels | - |
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| angularity | (noun) the property possessed by a shape that has angles | - |
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| (noun) a shape having one or more sharp angles | Synonyms: angular shape |
| anniversary | (noun) the date on which an event occurred in some previous year (or the celebration of it) | Synonyms: day of remembrance |
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| antiarrhythmic | (noun) a drug used to treat an abnormal heart rhythm | Synonyms: antiarrhythmic drug, antiarrhythmic medication |
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| antibaryon | (noun) the antiparticle of a baryon; a hadron with a baryon number of -1 | - |
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| antidiarrheal | (noun) a drug used to control or stop diarrhea | Synonyms: antidiarrheal drug |
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| antiestablishmentarianism | (noun) the doctrine of opposition to the social and political establishment | Synonyms: antiestablishmentism |
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| antilogarithm | (noun) the number of which a given number is the logarithm | Synonyms: antilog |
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| antimacassar | (noun) a piece of ornamented cloth that protects the back of a chair from hair oils | - |
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| antimalarial | (noun) a medicinal drug used to prevent or treat malaria | Synonyms: antimalarial drug |
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| antiparticle | (noun) a particle that has the same mass as another particle but has opposite values for its other properties; interaction of a particle and its antiparticle results in annihilation and the production of radiant energy | - |
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| antiphonary | (noun) bound collection of antiphons | Synonyms: antiphonal |
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| antiquarian | (noun) an expert or collector of antiquities | Synonyms: antiquary, archaist |
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| antiquark | (noun) the antiparticle of a quark | - |
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| antiquary | (noun) an expert or collector of antiquities | Synonyms: antiquarian, archaist |
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| apar | (noun) South American armadillo with three bands of bony plates | Synonyms: three-banded armadillo, Tolypeutes tricinctus |
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| apartheid | (noun) a social policy or racial segregation involving political and economic and legal discrimination against people who are not Whites; the former official policy in South Africa | - |
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| apartment | (noun) a suite of rooms usually on one floor of an apartment house | Synonyms: flat |
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| apiarist | (noun) a farmer who keeps bees for their honey | Synonyms: apiculturist, beekeeper |
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| apiary | (noun) a shed containing a number of beehives | Synonyms: bee house |
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| apothecary | (noun) a health professional trained in the art of preparing and dispensing drugs | Synonyms: chemist, druggist, pharmacist, pill pusher, pill roller |
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| apparatchik | (noun) a communist who was a member of the administrative system of a communist party | - |
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| (noun) a humorous but derogatory term for an official of a large organization (especially a political organization) | - |
| apparatus | (noun) equipment designed to serve a specific function | Synonyms: setup |
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| (noun) (anatomy) a group of body parts that work together to perform a given function | - |
| apparel | (noun) clothing in general | Synonyms: clothes, dress, wearing apparel |
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| apparency | (noun) the property of being apparent | Synonyms: apparentness |
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| apparentness | (noun) the property of being apparent | Synonyms: apparency |
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| apparition | (noun) an act of appearing or becoming visible unexpectedly | - |
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| (noun) something existing in perception only | Synonyms: fantasm, phantasm, phantasma, phantom, shadow |
| (noun) the appearance of a ghostlike figure | - |
| (noun) a ghostly appearing figure | Synonyms: fantasm, phantasm, phantasma, phantom, specter, spectre |
| appearance | (noun) the act of appearing in public view | - |
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| (noun) formal attendance (in court or at a hearing) of a party in an action | Synonyms: appearing, coming into court |
| (noun) pretending that something is the case in order to make a good impression | Synonyms: show |
| (noun) outward or visible aspect of a person or thing | Synonyms: visual aspect |
| (noun) a mental representation | - |
| (noun) the event of coming into sight | - |
| appearing | (noun) formal attendance (in court or at a hearing) of a party in an action | Synonyms: appearance, coming into court |
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| appendicularia | (noun) free-swimming tadpole-shaped pelagic tunicate resembling larvae of other tunicates | - |
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| applecart | (noun) a handcart from which apples and other fruit are sold in the street | - |
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| (noun) the planning that is disrupted when someone `upsets the applecart' | - |
| aquamarine | (noun) a shade of blue tinged with green | Synonyms: aqua, cobalt blue, greenish blue, peacock blue, turquoise |
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| (noun) a transparent variety of beryl that is blue green in color | - |
| aquarium | (noun) a tank or pool or bowl filled with water for keeping live fish and underwater animals | Synonyms: fish tank, marine museum |
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| ar | (noun) a unit of surface area equal to 100 square meters | Synonyms: are |
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| arabesque | (noun) an ornament that interlaces simulated foliage in an intricate design | - |
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| (noun) position in which the dancer has one leg raised behind and arms outstretched in a conventional pose | - |
| arability | (noun) the quality of land that is appropriate for cultivation | - |
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| arachnid | (noun) air-breathing arthropods characterized by simple eyes and four pairs of legs | Synonyms: arachnoid |
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| arachnoid | (noun) air-breathing arthropods characterized by simple eyes and four pairs of legs | Synonyms: arachnid |
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| (noun) the middle of the 3 meninges | Synonyms: arachnoid membrane |
| arachnophobia | (noun) a morbid fear of spiders | - |
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