| acathexia | (noun) an inability to retain bodily secretions | - |
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| acathexis | (noun) (psychoanalysis) a lack of cathexis; a condition in which significant objects or memories arouse no emotion in an individual | - |
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| actinomyxidian | (noun) of or relating to parasites of worms | - |
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| addax | (noun) large antelope with lightly spiraled horns of desert regions of northern Africa | Synonyms: Addax nasomaculatus |
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| admixture | (noun) the act of mixing together | Synonyms: commixture, intermixture, mix, mixing, mixture |
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| (noun) an additional ingredient that is added by mixing with the base | Synonyms: intermixture |
| (noun) the state of impairing the quality or reducing the value of something | Synonyms: alloy |
| adnexa | (noun) accessory or adjoining anatomical parts or appendages to an organ (especially of the embryo) | Synonyms: annexa |
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| adoxography | (noun) fine writing in praise of trivial or base subjects | - |
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| affix | (noun) a linguistic element added to a word to produce an inflected or derived form | - |
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| affixation | (noun) formation of a word by means of an affix | - |
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| (noun) the act of attaching or affixing something | Synonyms: attachment |
| (noun) the result of adding an affix to a root word | - |
| aflatoxin | (noun) a potent carcinogen from the fungus Aspergillus; can be produced and stored for use as a bioweapon | - |
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| aldohexose | (noun) a monosaccharide sugar having six carbon atoms and an aldehyde group | - |
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| alexandrite | (noun) a green variety of chrysoberyl used as a gemstone | - |
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| alexia | (noun) inability to perceive written words | Synonyms: visual aphasia, word blindness |
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| alexic | (noun) a person with alexia | - |
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| ambidexterity | (noun) the property of being equally skillful with each hand | Synonyms: ambidextrousness |
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| ambidextrousness | (noun) the property of being equally skillful with each hand | Synonyms: ambidexterity |
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| amoxicillin | (noun) an antibiotic; a semisynthetic oral penicillin (trade names Amoxil and Larotid and Polymox and Trimox and Augmentin) used to treat bacterial infections | Synonyms: Amoxil, Augmentin, Larotid, Polymox, Trimox |
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| amphimixis | (noun) union of sperm and egg in sexual reproduction | - |
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| (noun) reproduction involving the union or fusion of a male and a female gamete | Synonyms: sexual reproduction |
| amphioxus | (noun) small translucent lancet-shaped burrowing marine animal; primitive forerunner of the vertebrates | Synonyms: lancelet |
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| amyxia | (noun) a condition in which no mucus in produced | - |
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| anaphylaxis | (noun) hypersensitivity reaction to the ingestion or injection of a substance (a protein or drug) resulting from prior contact with a substance | - |
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| anatoxin | (noun) a bacterial toxin that has been weakened until it is no longer toxic but is strong enough to induce the formation of antibodies and immunity to the specific disease caused by the toxin | Synonyms: toxoid |
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| annex | (noun) an addition that extends a main building | Synonyms: annexe, extension, wing |
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| annexa | (noun) accessory or adjoining anatomical parts or appendages to an organ (especially of the embryo) | Synonyms: adnexa |
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| annexation | (noun) the formal act of acquiring something (especially territory) by conquest or occupation | - |
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| (noun) incorporation by joining or uniting | Synonyms: appropriation |
| annexe | (noun) an addition that extends a main building | Synonyms: annex, extension, wing |
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| anomalopteryx | (noun) the smallest moa; slender moa about the size of a large turkey | Synonyms: Anomalopteryx oweni |
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| anorexia | (noun) a prolonged disorder of eating due to loss of appetite | - |
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| anorexic | (noun) a person suffering from anorexia nervosa | Synonyms: anorectic |
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| anoxemia | (noun) abnormally low oxygen content in arterial blood | - |
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| anoxia | (noun) severe hypoxia; absence of oxygen in inspired gases or in arterial blood or in the tissues | - |
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| antapex | (noun) the point opposite in direction from the solar apex; the point the solar system is moving away from | - |
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| antefix | (noun) carved ornament at the eaves of a tile roof concealing the joints between tiles | - |
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| anthrax | (noun) a highly infectious animal disease (especially cattle and sheep); it can be transmitted to people | Synonyms: splenic fever |
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| (noun) a disease of humans that is not communicable; caused by infection with Bacillus anthracis followed by septicemia | - |
| anticlimax | (noun) a change from a serious subject to a disappointing one | Synonyms: bathos |
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| (noun) a disappointing decline after a previous rise | - |
| antioxidant | (noun) substance that inhibits oxidation or inhibits reactions promoted by oxygen or peroxides | - |
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| antitoxin | (noun) an antibody that can neutralize a specific toxin | - |
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| anxiety | (noun) a vague unpleasant emotion that is experienced in anticipation of some (usually ill-defined) misfortune | - |
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| (noun) (psychiatry) a relatively permanent state of worry and nervousness occurring in a variety of mental disorders, usually accompanied by compulsive behavior or attacks of panic | Synonyms: anxiousness |
| anxiolytic | (noun) a tranquilizer used to relieve anxiety and reduce tension and irritability | Synonyms: antianxiety drug, anxiolytic drug, minor tranquilizer, minor tranquilliser, minor tranquillizer |
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| anxiousness | (noun) a feeling of mild anxiety about possible developments | Synonyms: disquiet |
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| (noun) (psychiatry) a relatively permanent state of worry and nervousness occurring in a variety of mental disorders, usually accompanied by compulsive behavior or attacks of panic | Synonyms: anxiety |
| apex | (noun) the highest point (of something) | Synonyms: acme, peak, vertex |
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| (noun) the point on the celestial sphere toward which the sun and solar system appear to be moving relative to the fixed stars | Synonyms: apex of the sun's way, solar apex |
| apomixis | (noun) any of several kinds of reproduction without fertilization | - |
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| apoplexy | (noun) a sudden loss of consciousness resulting when the rupture or occlusion of a blood vessel leads to oxygen lack in the brain | Synonyms: cerebrovascular accident, CVA, stroke |
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| appendix | (noun) a vestigial process that extends from the lower end of the cecum and that resembles a small pouch | Synonyms: cecal appendage, vermiform appendix, vermiform process |
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| (noun) supplementary material that is collected and appended at the back of a book | - |
| approximation | (noun) the act of bringing near or bringing together especially the cut edges of tissue | Synonyms: bringing close together |
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| (noun) the quality of coming near to identity (especially close in quantity) | - |
| (noun) an approximate calculation of quantity or degree or worth | Synonyms: estimate, estimation, idea |
| (noun) an imprecise or incomplete account | - |
| apraxia | (noun) inability to make purposeful movements | - |
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| apteryx | (noun) nocturnal flightless bird of New Zealand having a long neck and stout legs; only surviving representative of the order Apterygiformes | Synonyms: kiwi |
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| archaeopteryx | (noun) extinct primitive toothed bird of the Jurassic period having a long feathered tail and hollow bones; usually considered the most primitive of all birds | Synonyms: Archaeopteryx lithographica, archeopteryx |
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| archeopteryx | (noun) extinct primitive toothed bird of the Jurassic period having a long feathered tail and hollow bones; usually considered the most primitive of all birds | Synonyms: archaeopteryx, Archaeopteryx lithographica |
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| areflexia | (noun) absence of a reflex; a sign of possible nerve damage | - |
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| asexuality | (noun) having no evident sex or sex organs | Synonyms: sexlessness |
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| asphyxia | (noun) a condition in which insufficient or no oxygen and carbon dioxide are exchanged on a ventilatory basis; caused by choking or drowning or electric shock or poison gas | - |
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| asphyxiation | (noun) killing by depriving of oxygen | Synonyms: suffocation |
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| (noun) the condition of being deprived of oxygen (as by having breathing stopped) | Synonyms: suffocation |
| asphyxiator | (noun) a manually operated device for extinguishing small fires | Synonyms: extinguisher, fire extinguisher |
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| ataraxia | (noun) peace of mind | - |
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| ataraxis | (noun) the absence of mental stress or anxiety | Synonyms: heartsease, peace, peace of mind, peacefulness, repose, serenity |
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| ataxia | (noun) inability to coordinate voluntary muscle movements; unsteady movements and staggering gait | Synonyms: ataxy, dyssynergia, motor ataxia |
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| ataxy | (noun) inability to coordinate voluntary muscle movements; unsteady movements and staggering gait | Synonyms: ataxia, dyssynergia, motor ataxia |
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| auspex | (noun) (ancient Rome) a religious official who interpreted omens to guide public policy | Synonyms: augur |
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| autosexing | (noun) (especially of domestic fowl) breeding to reveal differential sex characteristics at hatching | - |
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| auxesis | (noun) growth from increase in cell size without cell division | - |
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| auxiliary | (noun) someone who acts as assistant | Synonyms: aide |
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| auxin | (noun) a plant hormone that promotes root formation and bud growth | - |
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| aviatrix | (noun) a woman aviator | Synonyms: airwoman, aviatress |
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| ax | (noun) an edge tool with a heavy bladed head mounted across a handle | Synonyms: axe |
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| axe | (noun) an edge tool with a heavy bladed head mounted across a handle | Synonyms: ax |
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| axerophthol | (noun) any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes | Synonyms: A, antiophthalmic factor, vitamin A |
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| axil | (noun) the upper angle between an axis and an offshoot such as a branch or leafstalk | - |
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| axilla | (noun) the hollow under the arm where it is joined to the shoulder | Synonyms: armpit, axillary cavity, axillary fossa |
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| axiology | (noun) the study of values and value judgments | - |
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| axiom | (noun) a saying that is widely accepted on its own merits | Synonyms: maxim |
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| (noun) (logic) a proposition that is not susceptible of proof or disproof; its truth is assumed to be self-evident | - |
| axis | (noun) the center around which something rotates | Synonyms: axis of rotation |
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| (noun) the 2nd cervical vertebra; serves as a pivot for turning the head | Synonyms: axis vertebra |
| (noun) a straight line through a body or figure that satisfies certain conditions | - |
| (noun) a group of countries in special alliance | Synonyms: bloc |
| (noun) the main stem or central part about which plant organs or plant parts such as branches are arranged | - |
| axle | (noun) a shaft on which a wheel rotates | - |
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| axletree | (noun) a dead axle on a carriage or wagon that has terminal spindles on which the wheels revolve | - |
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| axolemma | (noun) outer membrane covering an axon | - |
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| axolotl | (noun) larval salamander of mountain lakes of Mexico that usually lives without metamorphosing | Synonyms: Ambystoma mexicanum, mud puppy |
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| axon | (noun) long nerve fiber that conducts away from the cell body of the neuron | Synonyms: axone |
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| axone | (noun) long nerve fiber that conducts away from the cell body of the neuron | Synonyms: axon |
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| axseed | (noun) European herb resembling vetch; naturalized in the eastern United States; having umbels of pink-and-white flowers and sharp-angled pods | Synonyms: Coronilla varia, crown vetch |
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| bandbox | (noun) a light cylindrical box for holding light articles of attire (especially hats) | - |
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| bauxite | (noun) a clay-like mineral; the chief ore of aluminum; composed of aluminum oxides and aluminum hydroxides; used as an abrasive and catalyst | - |
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| beeswax | (noun) a yellow to brown wax secreted by honeybees to build honeycombs | - |
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| bisexual | (noun) a person who is sexually attracted to both sexes | Synonyms: bisexual person |
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| bisexuality | (noun) sexual activity with both men and women | - |
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| (noun) showing characteristics of both sexes | Synonyms: androgyny, hermaphroditism |
| blaxploitation | (noun) the exploitation of black people (especially with regard to stereotyped roles in movies) | - |
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| bobbysoxer | (noun) an adolescent girl wearing bobby socks (common in the 1940s) | Synonyms: bobby-socker |
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| bonxie | (noun) gull-like jaeger of northern seas | Synonyms: skua |
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| borax | (noun) an ore of boron consisting of hydrated sodium borate; used as a flux or cleansing agent | - |
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| botulismotoxin | (noun) potent bacterial toxin produced by the bacterium Clostridium botulinum that causes botulism; can be used as a bioweapon | Synonyms: botulin, botulinus toxin |
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| box | (noun) a blow with the hand (usually on the ear) | - |
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| (noun) a (usually rectangular) container; may have a lid | - |
| (noun) separate partitioned area in a public place for a few people | - |
| (noun) private area in a theater or grandstand where a small group can watch the performance | Synonyms: loge |
| (noun) the driver's seat on a coach | Synonyms: box seat |
| (noun) any one of several designated areas on a ball field where the batter or catcher or coaches are positioned | - |
| (noun) evergreen shrubs or small trees | Synonyms: boxwood |
| (noun) the quantity contained in a box | Synonyms: boxful |
| (noun) a rectangular drawing | - |
| (noun) a predicament from which a skillful or graceful escape is impossible | Synonyms: corner |
| boxberry | (noun) spicy red berrylike fruit; source of wintergreen oil | Synonyms: checkerberry, spiceberry, teaberry, wintergreen |
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| (noun) creeping woody plant of eastern North America with shiny evergreen leaves and scarlet berries | Synonyms: Mitchella repens, partridgeberry, twinberry |
| boxcar | (noun) a freight car with roof and sliding doors in the sides | - |
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| boxcars | (noun) (usually plural) an expression used when two dice are thrown and both come up showing six spots | - |
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| boxer | (noun) a breed of stocky medium-sized short-haired dog with a brindled coat and square-jawed muzzle developed in Germany | - |
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| (noun) someone who fights with his fists for sport | Synonyms: pugilist |
| (noun) a workman employed to pack things into containers | Synonyms: bagger, packer |
| boxers | (noun) underpants worn by men | Synonyms: boxershorts, drawers, shorts, underdrawers |
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| boxershorts | (noun) underpants worn by men | Synonyms: boxers, drawers, shorts, underdrawers |
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| boxfish | (noun) any of numerous small tropical fishes having body and head encased in bony plates | Synonyms: trunkfish |
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| boxful | (noun) the quantity contained in a box | Synonyms: box |
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| boxing | (noun) fighting with the fists | Synonyms: fisticuffs, pugilism |
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| (noun) the enclosure of something in a package or box | Synonyms: packing |
| boxthorn | (noun) any of various shrubs or vines of the genus Lycium with showy flowers and bright berries | Synonyms: matrimony vine |
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