| antireligiousness | (noun) The state or condition of being opposed to religion. | - |
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| antiviral | (adjective) inhibiting or stopping the growth and reproduction of viruses | - |
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| (noun) any drug that destroys viruses | Synonyms: antiviral agent, antiviral drug |
| arborvirus | (noun) a large heterogeneous group of RNA viruses divisible into groups on the basis of the virions; they have been recovered from arthropods, bats, and rodents; most are borne by arthropods; they are linked by the epidemiologic concept of transmission between vertebrate hosts by arthropod vectors (mosquitoes, ticks, sandflies, midges, etc.) that feed on blood; they can cause mild fevers, hepatitis, hemorrhagic fever, and encephalitis | Synonyms: arbovirus |
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| arbovirus | (noun) a large heterogeneous group of RNA viruses divisible into groups on the basis of the virions; they have been recovered from arthropods, bats, and rodents; most are borne by arthropods; they are linked by the epidemiologic concept of transmission between vertebrate hosts by arthropod vectors (mosquitoes, ticks, sandflies, midges, etc.) that feed on blood; they can cause mild fevers, hepatitis, hemorrhagic fever, and encephalitis | Synonyms: arborvirus |
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| arenavirus | (noun) animal viruses belonging to the family Arenaviridae | - |
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| armchair | (noun) chair with a support on each side for arms | - |
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| armoire | (noun) a large wardrobe or cabinet; originally used for storing weapons | - |
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| aspirant | (adjective) desiring or striving for recognition or advancement | Synonyms: aspiring, wishful |
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| (noun) an ambitious and aspiring young person | Synonyms: aspirer, hopeful, wannabe, wannabee |
| aspirate | (noun) a consonant pronounced with aspiration | - |
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| (noun) a speech sound having as an obvious concomitant an audible puff of breath, as initial stop consonants or initial h -sounds. | - |
| (verb) inhale (air, water, etc.) | - |
| (verb) pronounce with aspiration; of stop sounds | - |
| (verb) remove by suction | Synonyms: draw out, suck out |
| aspiration | (noun) the act of inhaling; the drawing in of air (or other gases) as in breathing | Synonyms: breathing in, inhalation, inspiration, intake |
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| (noun) a will to succeed | - |
| (noun) a manner of articulation involving an audible release of breath | - |
| (noun) a cherished desire | Synonyms: ambition, dream |
| aspirator | (noun) a pump that draws air or another gas through a liquid | - |
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| aspire | (verb) have an ambitious plan or a lofty goal | Synonyms: aim, draw a bead on, shoot for |
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| aspirer | (noun) an ambitious and aspiring young person | Synonyms: aspirant, hopeful, wannabe, wannabee |
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| aspirin | (noun) the acetylated derivative of salicylic acid; used as an analgesic anti-inflammatory drug (trade names Bayer, Empirin, and St. Joseph) usually taken in tablet form; used as an antipyretic; slows clotting of the blood by poisoning platelets | Synonyms: acetylsalicylic acid, Bayer, Empirin, St. Joseph |
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| aspiring | (adjective) desiring or striving for recognition or advancement | Synonyms: aspirant, wishful |
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| astir | (adjective) on the move | Synonyms: about |
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| (adjective) out of bed | Synonyms: up |
| athirst | (adjective) (usually followed by `for') extremely desirous | Synonyms: hungry, thirsty |
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| attire | (noun) clothing of a distinctive style or for a particular occasion | Synonyms: dress, garb |
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| (verb) put on special clothes to appear particularly appealing and attractive | Synonyms: deck out, deck up, dress up, fancy up, fig out, fig up, get up, gussy up, overdress, prink, rig out, tog out, tog up, trick out, trick up |
| attired | (adjective) dressed or clothed especially in fine attire; often used in combination | Synonyms: appareled, dressed, garbed, garmented, habilimented, robed |
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| autogiro | (noun) an aircraft that is supported in flight by unpowered rotating horizontal wings (or blades); forward propulsion is provided by a conventional propeller | Synonyms: autogyro, gyroplane |
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| avirulent | (adjective) not virulent; unable to produce disease | - |
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| avoirdupois | (noun) excess bodily weight | Synonyms: blubber, fat, fatness |
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| (noun) a system of weights based on the 16-ounce pound (or 7,000 grains) | Synonyms: avoirdupois weight |
| azadirachtin | (noun) insecticide | - |
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| babiroussa | (noun) Indonesian wild pig with enormous curved canine teeth | Synonyms: babirusa, babirussa, Babyrousa Babyrussa |
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| babirusa | (noun) Indonesian wild pig with enormous curved canine teeth | Synonyms: babiroussa, babirussa, Babyrousa Babyrussa |
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| babirussa | (noun) Indonesian wild pig with enormous curved canine teeth | Synonyms: babiroussa, babirusa, Babyrousa Babyrussa |
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| backfire | (noun) a miscalculation that recoils on its maker | Synonyms: boomerang |
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| (noun) a loud noise made by the explosion of fuel in the manifold or exhaust of an internal combustion engine | - |
| (noun) the backward escape of gases and unburned gunpowder after a gun is fired | Synonyms: blowback |
| (noun) a fire that is set intentionally in order to slow an approaching forest fire or grassfire by clearing a burned area in its path | - |
| (verb) set a controlled fire to halt an advancing forest to prairie fire | - |
| (verb) emit a loud noise as a result of undergoing a backfire | - |
| (verb) come back to the originator of an action with an undesired effect | Synonyms: backlash, recoil |
| backstair | (adjective) secret and sly or sordid | Synonyms: backstairs, furtive |
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| backstairs | (adjective) secret and sly or sordid | Synonyms: backstair, furtive |
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| (noun) a second staircase at the rear of a building | - |
| bairn | (noun) a child: son or daughter | - |
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| balefire | (noun) a large outdoor fire that is lighted as a signal or in celebration | Synonyms: bonfire |
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| barbwire | (noun) strong wire with barbs at regular intervals used to prevent passage | Synonyms: barbed wire |
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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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| bemire | (verb) make soiled, filthy, or dirty | Synonyms: begrime, colly, dirty, grime, soil |
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| besmirch | (verb) charge falsely or with malicious intent; attack the good name and reputation of someone | Synonyms: asperse, calumniate, defame, denigrate, slander, smear, smirch, sully |
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| (verb) smear so as to make dirty or stained | Synonyms: smirch |
| bestir | (verb) become active | Synonyms: rouse |
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| bidirectional | (adjective) reactive or functioning or allowing movement in two usually opposite directions | - |
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| bilirubin | (noun) an orange-yellow pigment in the bile that forms as a product of hemoglobin; excess amounts in the blood produce the yellow appearance observed in jaundice | Synonyms: haematoidin, hematoidin |
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| billionaire | (noun) a very rich person whose material wealth is valued at more than a billion dollars | - |
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| biopiracy | (noun) biological theft; illegal collection of indigenous plants by corporations who patent them for their own use | - |
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| biracial | (adjective) consisting of or combining two races | - |
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| biradial | (adjective) showing both bilateral and radial symmetry | - |
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| biradially | (adverb) in a biradial manner | - |
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| biramous | (adjective) resembling a fork; divided or separated into two branches | Synonyms: bifurcate, branched, forficate, fork-like, forked, pronged, prongy |
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| birch | (adjective) consisting of or made of wood of the birch tree | Synonyms: birchen, birken |
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| (noun) a switch consisting of a twig or a bundle of twigs from a birch tree; used to hit people as punishment | Synonyms: birch rod |
| (noun) any betulaceous tree or shrub of the genus Betula having a thin peeling bark | Synonyms: birch tree |
| (noun) hard close-grained wood of any of various birch trees; used especially in furniture and interior finishes and plywood | - |
| (verb) whip with a birch twig | - |
| birchbark | (noun) a canoe made with the bark of a birch tree | Synonyms: birch bark, birchbark canoe |
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| birchen | (adjective) consisting of or made of wood of the birch tree | Synonyms: birch, birken |
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| bird | (noun) warm-blooded egg-laying vertebrates characterized by feathers and forelimbs modified as wings | - |
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| (noun) badminton equipment consisting of a ball of cork or rubber with a crown of feathers | Synonyms: birdie, shuttle, shuttlecock |
| (noun) a cry or noise made to express displeasure or contempt | Synonyms: boo, Bronx cheer, hiss, hoot, raspberry, razz, razzing, snort |
| (noun) the flesh of a bird or fowl (wild or domestic) used as food | Synonyms: fowl |
| (noun) informal terms for a (young) woman | Synonyms: chick, dame, doll, skirt, wench |
| (verb) watch and study birds in their natural habitat | Synonyms: birdwatch |
| birdbath | (noun) an ornamental basin (usually in a garden) for birds to bathe in | - |
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| birdbrain | (noun) a person with confused ideas; incapable of serious thought | Synonyms: addle-head, addlehead, loon |
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| birdcage | (noun) a cage in which a bird can be kept | - |
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| birdcall | (noun) a device for imitating a birdcall | - |
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| (noun) the characteristic sound produced by a bird | Synonyms: birdsong, call, song |
| birder | (noun) a person who identifies and studies birds in their natural habitats | Synonyms: bird watcher |
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| birdfeeder | (noun) an outdoor device that supplies food for wild birds | Synonyms: bird feeder, feeder |
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| birdhouse | (noun) a shelter for birds | - |
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| birdie | (noun) badminton equipment consisting of a ball of cork or rubber with a crown of feathers | Synonyms: bird, shuttle, shuttlecock |
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| (noun) (golf) a score of one stroke under par on a hole | - |
| (verb) shoot in one stroke under par | - |
| birdlime | (noun) a sticky adhesive that is smeared on small branches to capture small birds | Synonyms: lime |
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| (verb) spread birdlime on branches to catch birds | Synonyms: lime |
| birdnest | (noun) nest where birds lay their eggs and hatch their young | Synonyms: bird's nest, bird nest |
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| (verb) gather birdnests | Synonyms: bird-nest |
| birdnesting | (noun) hunting for birds' nests to get the eggs | - |
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| birdseed | (noun) food given to birds; usually mixed seeds | Synonyms: bird feed, bird food |
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| birdsong | (noun) the characteristic sound produced by a bird | Synonyms: birdcall, call, song |
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| birdwatch | (verb) watch and study birds in their natural habitat | Synonyms: bird |
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| birefringence | (noun) splitting a ray into two parallel rays polarized perpendicularly | Synonyms: double refraction |
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| birefringent | (adjective) relating to or characterized by double refraction | - |
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| biretta | (noun) a stiff cap with ridges across the crown; worn by Roman Catholic clergy | Synonyms: berretta, birretta |
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| biriani | (noun) an Indian dish made with highly seasoned rice and meat or fish or vegetables | Synonyms: biryani |
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| birken | (adjective) consisting of or made of wood of the birch tree | Synonyms: birch, birchen |
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| birl | (verb) cause to spin | Synonyms: spin, twirl, whirl |
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| (verb) cause a floating log to rotate by treading | Synonyms: birle |
| birle | (verb) cause a floating log to rotate by treading | Synonyms: birl |
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| birling | (noun) rotating a log rapidly in the water (as a competitive sport) | Synonyms: logrolling |
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| birr | (noun) the basic unit of money in Ethiopia; equal to 100 cents | - |
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| (noun) sound of something in rapid motion | Synonyms: whir, whirr, whirring |
| (verb) make a soft swishing sound | Synonyms: purr, whir, whirr, whiz, whizz |
| birretta | (noun) a stiff cap with ridges across the crown; worn by Roman Catholic clergy | Synonyms: berretta, biretta |
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| birth | (noun) the event of being born | Synonyms: nascence, nascency, nativity |
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| (noun) a baby born; an offspring | - |
| (noun) the process of giving birth | Synonyms: birthing, giving birth, parturition |
| (noun) the kinship relation of an offspring to the parents | Synonyms: parentage |
| (noun) the time when something begins (especially life) | - |
| (verb) cause to be born | Synonyms: bear, deliver, give birth, have |
| birthday | (noun) an anniversary of the day on which a person was born (or the celebration of it) | - |
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| (noun) the date on which a person was born | Synonyms: natal day |
| birthing | (noun) the process of giving birth | Synonyms: birth, giving birth, parturition |
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| birthmark | (noun) a blemish on the skin that is formed before birth | Synonyms: nevus |
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| birthplace | (noun) the place where someone was born | Synonyms: place of birth |
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| (noun) where something originated or was nurtured in its early existence | Synonyms: cradle, place of origin, provenance, provenience |
| birthrate | (noun) the ratio of live births in an area to the population of that area; expressed per 1000 population per year | Synonyms: birth rate, fertility, fertility rate, natality |
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| birthright | (noun) a right or privilege that you are entitled to at birth | - |
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| (noun) an inheritance coming by right of birth (especially by primogeniture) | Synonyms: patrimony |
| birthroot | (noun) trillium of eastern North America having malodorous pink to purple flowers and an astringent root used in folk medicine especially to ease childbirth | Synonyms: purple trillium, red trillium, Trillium erectum |
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| birthwort | (noun) creeping plant having curving flowers thought to resemble fetuses; native to Europe; naturalized Great Britain and eastern North America | Synonyms: Aristolochia clematitis |
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| biryani | (noun) an Indian dish made with highly seasoned rice and meat or fish or vegetables | Synonyms: biriani |
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| blackbird | (noun) any bird of the family Icteridae whose male is black or predominantly black | Synonyms: New World blackbird |
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| (noun) common black European thrush | Synonyms: European blackbird, merl, merle, ousel, ouzel, Turdus merula |
| bloodthirstiness | (noun) a disposition to shed blood | Synonyms: bloodiness |
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| bloodthirsty | (adjective) marked by eagerness to resort to violence and bloodshed | Synonyms: bloody-minded, sanguinary |
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| bluebird | (noun) blue North American songbird | - |
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| (noun) fruit-eating mostly brilliant blue songbird of the East Indies | Synonyms: fairy bluebird |
| bonfire | (noun) a large outdoor fire that is lighted as a signal or in celebration | Synonyms: balefire |
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| bookfair | (noun) bazaar at which books are sold or auctioned off in order to raise funds for a worthy cause | Synonyms: book fair |
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| (noun) fair organized by publishers or booksellers to promote the sale of books | Synonyms: book fair |
| boudoir | (noun) a lady's bedroom or private sitting room | - |
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| bowerbird | (noun) any of various birds of the Australian region whose males build ornamented structures resembling bowers in order to attract females | Synonyms: catbird |
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| buirdly | (adjective) muscular and heavily built | Synonyms: beefy, burly, husky, strapping |
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| bunyavirus | (noun) an animal virus belonging to the family Bunyaviridae; can be used as a bioweapon | - |
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| buspirone | (noun) a drug (trade name BuSpar) designed specifically for anxiety | Synonyms: BuSpar |
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| butcherbird | (noun) shrikes that impale their prey on thorns | - |
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| (noun) large carnivorous Australian bird with the shrike-like habit of impaling prey on thorns | - |
| cairn | (noun) small rough-haired breed of terrier from Scotland | Synonyms: cairn terrier |
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| (noun) a mound of stones piled up as a memorial or to mark a boundary or path | - |
| cairned | (adjective) marked by cairns | - |
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| cairngorm | (noun) a smoky yellow or brown quartz | Synonyms: smoky quartz |
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| camelhair | (noun) a soft tan cloth made with the hair of a camel | Synonyms: camel's hair |
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| camgirl | (noun) a female performer who performs sexual acts by camera on the internet | - |
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| campfire | (noun) a small outdoor fire for warmth or cooking (as at a camp) | - |
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