| abele | (noun) a poplar that is widely cultivated in the United States; has white bark and leaves with whitish undersurfaces | Synonyms: aspen poplar, Populus alba, silver-leaved poplar, white aspen, white poplar |
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| abelia | (noun) any of various deciduous or evergreen ornamental shrubs of the genus Abelia having opposite simple leaves and cymes of small white or pink or purplish flowers; Asia and Mexico | - |
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| abelmosk | (noun) bushy herb of tropical Asia grown for its yellow or pink to scarlet blooms that resemble the hibiscus | Synonyms: Abelmoschus moschatus, Hibiscus moschatus, musk mallow |
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| accelerando | (noun) a gradually increasing tempo of music | - |
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| acceleration | (noun) the act of accelerating; increasing the speed | Synonyms: quickening, speedup |
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| (noun) an increase in rate of change | - |
| (noun) (physics) a rate of increase of velocity | - |
| accelerator | (noun) a valve that regulates the supply of fuel to the engine | Synonyms: throttle, throttle valve |
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| (noun) a scientific instrument that increases the kinetic energy of charged particles | Synonyms: atom smasher, particle accelerator |
| (noun) a pedal that controls the throttle valve | Synonyms: accelerator pedal, gas, gas pedal, gun, throttle |
| (noun) (chemistry) a substance that initiates or accelerates a chemical reaction without itself being affected | Synonyms: catalyst |
| accelerometer | (noun) an instrument for measuring the acceleration of aircraft or rockets | - |
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| adelgid | (noun) any of various insects that feed and form galls on conifers | - |
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| aerophilately | (noun) the collection and study of airmail stamps | - |
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| agelessness | (noun) the quality of being timeless and eternal | - |
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| airfield | (noun) a place where planes take off and land | Synonyms: field, flying field, landing field |
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| allele | (noun) (genetics) either of a pair (or series) of alternative forms of a gene that can occupy the same locus on a particular chromosome and that control the same character | Synonyms: allelomorph |
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| allelomorph | (noun) (genetics) either of a pair (or series) of alternative forms of a gene that can occupy the same locus on a particular chromosome and that control the same character | Synonyms: allele |
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| 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 |
| amberbell | (noun) eastern North American dogtooth having solitary yellow flowers marked with brown or purple and spotted interiors | Synonyms: Erythronium americanum, trout lily, yellow adder's tongue |
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| amelia | (noun) congenital absence of an arm or leg | - |
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| amelioration | (noun) the act of relieving ills and changing for the better | Synonyms: betterment, melioration |
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| ameloblast | (noun) a cell from which tooth enamel develops | - |
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| amelogenesis | (noun) the developmental process of forming tooth enamel | - |
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| andelmin | (noun) any of several tropical American trees of the genus Andira | Synonyms: angelim |
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| angel | (noun) spiritual being attendant upon God | - |
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| (noun) someone who provides financial support for some venture | Synonyms: backer |
| (noun) person of exceptional holiness | Synonyms: holy man, holy person, saint |
| angelfish | (noun) sharks with broad flat bodies and winglike pectoral fins but that swim the way sharks do | Synonyms: angel shark, monkfish, Squatina squatina |
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| (noun) a butterfly fish of the genus Pomacanthus | - |
| (noun) deep-bodied disk-shaped food fish of warmer western Atlantic coastal waters | Synonyms: Chaetodipterus faber, spadefish |
| angelica | (noun) aromatic stems or leaves or roots of Angelica Archangelica | - |
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| (noun) candied stalks of the angelica plant | - |
| (noun) any of various tall and stout herbs of the genus Angelica having pinnately compound leaves and small white or greenish flowers in compound umbels | Synonyms: angelique |
| angelim | (noun) any of several tropical American trees of the genus Andira | Synonyms: andelmin |
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| angelique | (noun) any of various tall and stout herbs of the genus Angelica having pinnately compound leaves and small white or greenish flowers in compound umbels | Synonyms: angelica |
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| angelology | (noun) the branch of theology that is concerned with angels | - |
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| angelus | (noun) the sound of a bell rung in Roman Catholic churches to announce the time when the Angelus should be recited | Synonyms: angelus bell |
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| angiotelectasia | (noun) dilation and enlargement of arterioles | - |
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| annelid | (noun) worms with cylindrical bodies segmented both internally and externally | Synonyms: annelid worm, segmented worm |
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| anopheline | (noun) any mosquito of the genus Anopheles | - |
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| antelope | (noun) graceful Old World ruminant with long legs and horns directed upward and backward; includes gazelles, springboks, impalas, addax, gerenuks, blackbucks, dik-diks | - |
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| anthelminthic | (noun) a medication capable of causing the evacuation of parasitic intestinal worms | Synonyms: anthelmintic, helminthic, vermifuge |
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| anthelmintic | (noun) a medication capable of causing the evacuation of parasitic intestinal worms | Synonyms: anthelminthic, helminthic, vermifuge |
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| antielectron | (noun) an elementary particle with positive charge; interaction of a positron and an electron results in annihilation | Synonyms: positron |
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| antireligiousness | (noun) The state or condition of being opposed to religion. | - |
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| aphelion | (noun) apoapsis in solar orbit; the point in the orbit of a planet or comet that is at the greatest distance from the sun | - |
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| aposelene | (noun) apoapsis in orbit around the moon | Synonyms: apolune |
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| apparel | (noun) clothing in general | Synonyms: clothes, dress, wearing apparel |
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| appellant | (noun) the party who appeals a decision of a lower court | Synonyms: plaintiff in error |
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| appellation | (noun) identifying word or words by which someone or something is called and classified or distinguished from others | Synonyms: appellative, denomination, designation |
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| (noun) a geographical indication used to identify where the grapes for a wine are grown | - |
| appellative | (noun) identifying word or words by which someone or something is called and classified or distinguished from others | Synonyms: appellation, denomination, designation |
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| arcella | (noun) an amoeba-like protozoan with a chitinous shell resembling an umbrella | - |
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| archangel | (noun) an angel ranked above the highest rank in the celestial hierarchy | - |
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| (noun) a biennial cultivated herb; its stems are candied and eaten and its roots are used medicinally | Synonyms: Angelica Archangelica, garden angelica |
| archiannelid | (noun) small primitive marine worm lacking external segmentation and resembling polychaete larvae | - |
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| archipelago | (noun) a group of many islands in a large body of water | - |
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| asphodel | (noun) any of various chiefly Mediterranean plants of the genera Asphodeline and Asphodelus having linear leaves and racemes of white or pink or yellow flowers | - |
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| atelectasis | (noun) collapse of an expanded lung (especially in infants); also failure of pulmonary alveoli to expand at birth | - |
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| ateleiosis | (noun) a form of infantilism characterized by physical underdevelopment but normal intelligence | Synonyms: ateliosis |
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| atelier | (noun) a studio especially for an artist or designer | Synonyms: artist's workroom |
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| ateliosis | (noun) a form of infantilism characterized by physical underdevelopment but normal intelligence | Synonyms: ateleiosis |
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| autotelism | (noun) belief that a work of art is an end in itself or its own justification | - |
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| babel | (noun) a confusion of voices and other sounds | - |
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| bachelor | (noun) a man who has never been married | Synonyms: unmarried man |
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| (noun) a knight of the lowest order; could display only a pennon | Synonyms: bachelor-at-arms, knight bachelor |
| bachelorette | (noun) a young unmarried woman who lives alone | Synonyms: bachelor girl |
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| bachelorhood | (noun) the state of being an unmarried man | - |
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| (noun) the time of a man's life prior to marriage | - |
| backfield | (noun) the offensive football players who line up behind the linemen | - |
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| baddeleyite | (noun) a mineral consisting of zirconium oxide | - |
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| bagatelle | (noun) a table game in which short cues are used to knock balls into holes that are guarded by wooden pegs; penalties are incurred if the pegs are knocked over | Synonyms: bar billiards |
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| (noun) something of little value or significance | Synonyms: fluff, frippery, frivolity |
| (noun) a light piece of music for piano | - |
| bagel | (noun) (Yiddish) glazed yeast-raised doughnut-shaped roll with hard crust | Synonyms: beigel |
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| bandelet | (noun) molding in the form of a ring; at top of a column | Synonyms: annulet, bandelette, bandlet, square and rabbet |
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| bandelette | (noun) molding in the form of a ring; at top of a column | Synonyms: annulet, bandelet, bandlet, square and rabbet |
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| barbel | (noun) slender tactile process on the jaws of a fish | Synonyms: feeler |
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| barbell | (noun) a bar to which heavy discs are attached at each end; used in weightlifting | - |
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| bargello | (noun) needlepoint embroidery stitch that produces zigzag lines | Synonyms: flame stitch |
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| barrel | (noun) a cylindrical container that holds liquids | Synonyms: cask |
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| (noun) a tube through which a bullet travels when a gun is fired | Synonyms: gun barrel |
| (noun) any of various units of capacity | Synonyms: bbl |
| (noun) the quantity that a barrel (of any size) will hold | Synonyms: barrelful |
| (noun) a bulging cylindrical shape; hollow with flat ends | Synonyms: drum |
| barrelfish | (noun) blackish fish of New England waters | Synonyms: black rudderfish, Hyperglyphe perciformis |
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| barrelful | (noun) the quantity that a barrel (of any size) will hold | Synonyms: barrel |
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| barrelhouse | (noun) a cheap drinking and dancing establishment | Synonyms: honky-tonk |
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| barrels | (noun) the amount that many barrels might hold | - |
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| baseline | (noun) the lines a baseball player must follow while running the bases | - |
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| (noun) the back line bounding each end of a tennis or handball court; when serving the server must not step over this line | Synonyms: service line |
| (noun) an imaginary line or standard by which things are measured or compared | - |
| battlefield | (noun) a region where a battle is being (or has been) fought | Synonyms: battleground, field, field of battle, field of honor |
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| bdellium | (noun) aromatic gum resin; similar to myrrh | - |
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| bechamel | (noun) milk thickened with a butter and flour roux | Synonyms: bechamel sauce, white sauce |
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| bedfellow | (noun) a person with whom you share a bed | Synonyms: bedmate |
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| (noun) a temporary associate | - |
| beeline | (noun) the most direct route | - |
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| beigel | (noun) (Yiddish) glazed yeast-raised doughnut-shaped roll with hard crust | Synonyms: bagel |
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| belay | (noun) something to which a mountain climber's rope can be secured | - |
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| belch | (noun) a reflex that expels gas noisily from the stomach through the mouth | Synonyms: belching, burp, burping, eructation |
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| belching | (noun) a reflex that expels gas noisily from the stomach through the mouth | Synonyms: belch, burp, burping, eructation |
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| (noun) the forceful expulsion of something from inside | - |
| beldam | (noun) a woman of advanced age | Synonyms: beldame |
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| (noun) an ugly evil-looking old woman | Synonyms: beldame, crone, hag, witch |
| beldame | (noun) a woman of advanced age | Synonyms: beldam |
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| (noun) an ugly evil-looking old woman | Synonyms: beldam, crone, hag, witch |
| beleaguering | (noun) the action of an armed force that surrounds a fortified place and isolates it while continuing to attack | Synonyms: besieging, military blockade, siege |
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| belemnite | (noun) a conical calcareous fossil tapering to a point at one end and with a conical cavity at the other end containing (when unbroken) a small chambered phragmocone from the shell of any of numerous extinct cephalopods of the family Belemnitidae | - |
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| belfry | (noun) a room (often at the top of a tower) where bells are hung | - |
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| (noun) a bell tower; usually stands alone unattached to a building | Synonyms: campanile |
| belieber | (noun) A fan of Justin Bieber | - |
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| belief | (noun) any cognitive content held as true | - |
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| (noun) a vague idea in which some confidence is placed | Synonyms: feeling, impression, notion, opinion |
| believability | (noun) the quality of being believable or trustworthy | Synonyms: credibility, credibleness |
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| believer | (noun) a person who has religious faith | Synonyms: worshiper, worshipper |
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| (noun) a supporter who accepts something as true | Synonyms: truster |
| believing | (noun) the cognitive process that leads to convictions | - |
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| belittlement | (noun) the act of making a person or a thing seem little or unimportant. | - |
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| belittling | (noun) the act of belittling | - |
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| (noun) a belittling comment | Synonyms: denigration |
| bell | (noun) a hollow device made of metal that makes a ringing sound when struck | - |
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| (noun) a push button at an outer door that gives a ringing or buzzing signal when pushed | Synonyms: buzzer, doorbell |
| (noun) the flared opening of a tubular device | - |
| (noun) a percussion instrument consisting of a set of tuned bells that are struck with a hammer; used as an orchestral instrument | Synonyms: chime, gong |
| (noun) the sound of a bell being struck | Synonyms: toll |
| (noun) the shape of a bell | Synonyms: bell shape, campana |
| (noun) (nautical) each of the eight half-hour units of nautical time signaled by strokes of a ship's bell; eight bells signals 4:00, 8:00, or 12:00 o'clock, either a.m. or p.m. | Synonyms: ship's bell |
| belladonna | (noun) an alkaloidal extract or tincture of the poisonous belladonna plant that is used medicinally | - |
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| (noun) perennial Eurasian herb with reddish bell-shaped flowers and shining black berries; extensively grown in United States; roots and leaves yield atropine | Synonyms: Atropa belladonna, belladonna plant, deadly nightshade |
| bellarmine | (noun) a stoneware drinking jug with a long neck; decorated with a caricature of Cardinal Bellarmine (17th century) | Synonyms: greybeard, long-beard, longbeard |
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| bellbird | (noun) any of several tropical American birds of the genus Procnias having a bell-like call | - |
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| bellboy | (noun) someone employed as an errand boy and luggage carrier around hotels | Synonyms: bellhop, bellman |
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| belle | (noun) a young woman who is the most charming and beautiful of several rivals | - |
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| bellflower | (noun) any of various plants of the genus Campanula having blue or white bell-shaped flowers | Synonyms: campanula |
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| bellhop | (noun) someone employed as an errand boy and luggage carrier around hotels | Synonyms: bellboy, bellman |
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| bellicoseness | (noun) a natural disposition to fight | Synonyms: bellicosity |
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