| abrupt | (adjective) surprisingly and unceremoniously brusque in manner | - |
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| (adjective) marked by sudden changes in subject and sharp transitions | Synonyms: disconnected |
| (adjective) dangerously steep | Synonyms: precipitous, sharp |
| (adjective) exceedingly sudden and unexpected | - |
| abruption | (noun) an instance of sudden interruption | Synonyms: breaking off |
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| abruptly | (adverb) quickly and without warning; happening unexpectedly; on impulse; without premeditation | Synonyms: all of a sudden, dead, of a sudden, on the spur of the moment, short, suddenly |
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| abruptness | (noun) the quality of happening with headlong haste or without warning | Synonyms: precipitance, precipitancy, precipitateness, precipitousness, suddenness |
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| (noun) the property possessed by a slope that is very steep | Synonyms: precipitousness, steepness |
| (noun) an abrupt discourteous manner | Synonyms: brusqueness, curtness, gruffness, shortness |
| abstruse | (adjective) difficult to penetrate; incomprehensible to one of ordinary understanding or knowledge | Synonyms: deep, recondite |
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| abstrusely | (adverb) in a manner difficult to understand | - |
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| abstruseness | (noun) the quality of being unclear or abstruse and hard to understand | Synonyms: obscureness, obscurity, reconditeness |
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| (noun) wisdom that is recondite and abstruse and profound | Synonyms: abstrusity, profoundness, profundity, reconditeness |
| abstrusity | (noun) wisdom that is recondite and abstruse and profound | Synonyms: abstruseness, profoundness, profundity, reconditeness |
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| acarus | (noun) any of several mites of the order Acarina | Synonyms: genus Acarus |
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| accrual | (noun) the act of accumulating | Synonyms: accruement, accumulation |
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| accrue | (verb) grow by addition | - |
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| (verb) come into the possession of | Synonyms: fall |
| accrued | (adjective) periodically accumulated over time | Synonyms: accumulated |
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| accruement | (noun) the act of accumulating | Synonyms: accrual, accumulation |
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| adenovirus | (noun) any of a group of viruses including those that in humans cause upper respiratory infections or infectious pinkeye | - |
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| airbrush | (noun) an atomizer to spray paint by means of compressed air | - |
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| (verb) paint with an airbrush | - |
| alarum | (noun) an automatic signal (usually a sound) warning of danger | Synonyms: alarm, alert, warning signal |
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| allosaurus | (noun) late Jurassic carnivorous dinosaur; similar to but somewhat smaller than tyrannosaurus | Synonyms: allosaur |
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| alphavirus | (noun) an arbovirus of the family Togaviridae that can cause a variety of encephalitis in horses | - |
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| altruism | (noun) the quality of unselfish concern for the welfare of others | Synonyms: selflessness |
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| altruist | (noun) someone who makes charitable donations intended to increase human well-being | Synonyms: philanthropist |
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| altruistic | (adjective) showing unselfish concern for the welfare of others | Synonyms: selfless |
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| altruistically | (adverb) in an altruistic manner | Synonyms: selflessly |
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| ambulacrum | (noun) one of the five areas on the undersurface of an echinoderm on which the tube feet are located | - |
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| anestrum | (noun) applies to nonhuman mammals: a state or interval of sexual inactivity between two periods of estrus | Synonyms: anestrus, anoestrum, anoestrus |
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| anestrus | (noun) applies to nonhuman mammals: a state or interval of sexual inactivity between two periods of estrus | Synonyms: anestrum, anoestrum, anoestrus |
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| ankylosaurus | (noun) having the back covered with thick bony plates; thought to have walked with a sprawling gait resembling a lizard's | Synonyms: ankylosaur |
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| anoestrum | (noun) applies to nonhuman mammals: a state or interval of sexual inactivity between two periods of estrus | Synonyms: anestrum, anestrus, anoestrus |
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| anoestrus | (noun) applies to nonhuman mammals: a state or interval of sexual inactivity between two periods of estrus | Synonyms: anestrum, anestrus, anoestrum |
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| antipruritic | (noun) a substance that relieves or prevents itching | - |
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| antiserum | (noun) blood serum containing antibodies against specific antigens; provides immunity to a disease | - |
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| antitrust | (adjective) of laws and regulations; designed to protect trade and commerce from unfair business practices | Synonyms: antimonopoly |
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| antrum | (noun) a natural cavity or hollow in a bone | - |
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| apatosaurus | (noun) huge quadrupedal herbivorous dinosaur common in North America in the late Jurassic | Synonyms: apatosaur, Apatosaurus excelsus, brontosaur, brontosaurus, thunder lizard |
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| 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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| arugula | (noun) erect European annual often grown as a salad crop to be harvested when young and tender | Synonyms: Eruca sativa, Eruca vesicaria sativa, garden rocket, rocket, rocket salad, roquette |
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| arui | (noun) wild sheep of northern Africa | Synonyms: Ammotragus lervia, aoudad, audad, Barbary sheep, maned sheep |
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| arum | (noun) any plant of the family Araceae; have small flowers massed on a spadix surrounded by a large spathe | Synonyms: aroid |
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| (noun) starch resembling sago that is obtained from cuckoopint root | - |
| arundinaceous | (adjective) of or relating to or resembling reedlike plants of the genus Arundinaria | - |
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| avirulent | (adjective) not virulent; unable to produce disease | - |
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| awestruck | (adjective) having or showing a feeling of mixed reverence and respect and wonder and dread | Synonyms: awed, awestricken |
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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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| bankrupt | (adjective) financially ruined | Synonyms: belly-up |
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| (noun) someone who has insufficient assets to cover their debts | Synonyms: insolvent |
| (verb) reduce to bankruptcy | Synonyms: break, ruin, smash |
| bankruptcy | (noun) a legal process intended to insure equality among the creditors of a corporation declared to be insolvent | - |
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| (noun) inability to discharge all your debts as they come due | Synonyms: failure |
| (noun) a state of complete lack of some abstract property | - |
| barosaurus | (noun) a dinosaur that could grow to be as tall as a building five stories tall | Synonyms: barosaur |
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| barunduki | (noun) terrestrial Siberian squirrel | Synonyms: baranduki, baronduki, burunduki, Eutamius asiaticus, Eutamius sibiricus |
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| begrudge | (verb) wish ill or allow unwillingly | Synonyms: resent |
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| (verb) be envious of; set one's heart on | Synonyms: envy |
| 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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| bottlebrush | (noun) a cylindrical brush on a thin shaft that is used to clean bottles | - |
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| breadcrumb | (noun) crumb of bread; used especially for coating or thickening | - |
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| breadfruit | (noun) a large round seedless or seeded fruit with a texture like bread; eaten boiled or baked or roasted or ground into flour; the roasted seeds resemble chestnuts | - |
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| (noun) native to Pacific islands and having edible fruit with a texture like bread | Synonyms: Artocarpus altilis, Artocarpus communis, breadfruit tree |
| brontosaurus | (noun) huge quadrupedal herbivorous dinosaur common in North America in the late Jurassic | Synonyms: apatosaur, apatosaurus, Apatosaurus excelsus, brontosaur, thunder lizard |
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| brucellosis | (noun) an infectious disease of domestic animals often resulting in spontaneous abortion; transmittable to human beings | Synonyms: Bang's disease, contagious abortion |
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| (noun) infectious bacterial disease of human beings transmitted by contact with infected animals or infected meat or milk products; characterized by fever and headache | Synonyms: Gibraltar fever, Malta fever, Mediterranean fever, Rock fever, undulant fever |
| brucine | (noun) a bitter alkaloid poison resembling strychnine and extracted from nux vomica | - |
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| bruin | (noun) large ferocious bear of Eurasia | Synonyms: brown bear, Ursus arctos |
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| (noun) a conventional name for a bear used in tales following usage in the old epic `Reynard the Fox' | - |
| bruise | (noun) an injury that doesn't break the skin but results in some discoloration | Synonyms: contusion |
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| (verb) damage (plant tissue) by abrasion or pressure | - |
| (verb) break up into small pieces for food preparation | - |
| (verb) injure the underlying soft tissue or bone of | Synonyms: contuse |
| (verb) hurt the feelings of | Synonyms: hurt, injure, offend, spite, wound |
| bruiser | (noun) a large and strong and heavyset man | Synonyms: bull, Samson, strapper |
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| bruising | (adjective) brutally forceful and compelling | - |
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| (adjective) causing mental or emotional injury | - |
| bruit | (verb) tell or spread rumors | Synonyms: rumor, rumour |
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| bruitism | (noun) The use in music of sounds taken from an extra-musical source or context. The term is used most often of percussion or of electronic music that suggests the sounds of machinery. | - |
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| brumal | (adjective) characteristic of or relating to winter | Synonyms: hibernal, hiemal |
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| brumous | (adjective) filled or abounding with fog or mist | Synonyms: foggy, hazy, misty |
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| brunch | (noun) combination of breakfast and lunch; usually served in late morning | - |
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| (verb) eat a meal in the late morning | - |
| brunet | (adjective) marked by dark or relatively dark pigmentation of hair or skin or eyes | Synonyms: brunette |
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| (noun) a person with dark (brown) hair | Synonyms: brunette |
| brunette | (adjective) marked by dark or relatively dark pigmentation of hair or skin or eyes | Synonyms: brunet |
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| (noun) a person with dark (brown) hair | Synonyms: brunet |
| brunt | (noun) main force of a blow etc | - |
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| brush | (noun) a minor short-term fight | Synonyms: clash, encounter, skirmish |
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| (noun) the act of brushing your hair | Synonyms: brushing |
| (noun) the act of brushing your teeth | Synonyms: brushing |
| (noun) contact with something dangerous or undesirable | - |
| (noun) a bushy tail or part of a bushy tail (especially of the fox) | - |
| (noun) an implement that has hairs or bristles firmly set into a handle | - |
| (noun) conducts current between rotating and stationary parts of a generator or motor | - |
| (noun) momentary contact | Synonyms: light touch |
| (noun) a dense growth of bushes | Synonyms: brushwood, coppice, copse, thicket |
| (verb) remove with or as if with a brush | - |
| (verb) touch lightly and briefly | - |
| (verb) rub with a brush, or as if with a brush | - |
| (verb) clean with a brush | - |
| (verb) cover by brushing | - |
| (verb) sweep across or over | Synonyms: sweep |
| brushed | (adjective) (of hair or clothing) groomed with a brush | - |
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| (adjective) (of fabrics) having soft nap produced by brushing | Synonyms: fleecy, napped |
| (adjective) touched lightly in passing; grazed against | - |
| brushing | (noun) the act of brushing your hair | Synonyms: brush |
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| (noun) the act of brushing your teeth | Synonyms: brush |
| brushlike | (adjective) resembling a brush | - |
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| brushup | (noun) practice intended to polish performance or refresh the memory | Synonyms: review |
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| brushwood | (noun) a dense growth of bushes | Synonyms: brush, coppice, copse, thicket |
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| (noun) the wood from bushes or small branches | - |
| brushwork | (noun) an artist's distinctive technique of applying paint with a brush | - |
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| brushy | (adjective) covered with or consisting of bushes or thickets | Synonyms: bosky |
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| brusk | (adjective) marked by rude or peremptory shortness | Synonyms: brusque, curt, short |
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| brusque | (adjective) marked by rude or peremptory shortness | Synonyms: brusk, curt, short |
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| brusquely | (adverb) in a blunt direct manner | Synonyms: bluffly, bluntly, flat out, roundly |
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| brusqueness | (noun) an abrupt discourteous manner | Synonyms: abruptness, curtness, gruffness, shortness |
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| brut | (adjective) (of champagne) extremely dry | - |
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| brutal | (adjective) disagreeably direct and precise | - |
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| (adjective) resembling a beast; showing lack of human sensibility | Synonyms: beastly, bestial, brute, brutish |
| (adjective) punishingly harsh | Synonyms: unrelenting |
| (adjective) (of persons or their actions) able or disposed to inflict pain or suffering | Synonyms: barbarous, cruel, fell, roughshod, savage, vicious |
| brutalisation | (noun) an act that makes people cruel or lacking normal human qualities | Synonyms: animalisation, animalization, brutalization |
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| (noun) the activity of treating someone savagely or viciously | Synonyms: brutalization |
| (noun) the condition of being treated in a cruel and savage manner | Synonyms: brutalization |
| brutalise | (verb) become brutal or insensitive and unfeeling | Synonyms: animalise, animalize, brutalize |
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| (verb) make brutal, unfeeling, or inhuman | Synonyms: animalise, animalize, brutalize |
| (verb) treat brutally | Synonyms: brutalize |
| brutality | (noun) a brutal barbarous savage act | Synonyms: barbarism, barbarity, savagery |
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| (noun) the trait of extreme cruelty | Synonyms: ferociousness, savagery, viciousness |
| brutalization | (noun) an act that makes people cruel or lacking normal human qualities | Synonyms: animalisation, animalization, brutalisation |
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| (noun) the activity of treating someone savagely or viciously | Synonyms: brutalisation |
| (noun) the condition of being treated in a cruel and savage manner | Synonyms: brutalisation |
| brutalize | (verb) become brutal or insensitive and unfeeling | Synonyms: animalise, animalize, brutalise |
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| (verb) make brutal, unfeeling, or inhuman | Synonyms: animalise, animalize, brutalise |
| (verb) treat brutally | Synonyms: brutalise |
| brutally | (adverb) in a vicious manner | Synonyms: savagely, viciously |
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| brute | (adjective) resembling a beast; showing lack of human sensibility | Synonyms: beastly, bestial, brutal, brutish |
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| (noun) a living organism characterized by voluntary movement | Synonyms: animal, animate being, beast, creature, fauna |
| (noun) a cruelly rapacious person | Synonyms: beast, savage, wildcat, wolf |
| brutish | (adjective) resembling a beast; showing lack of human sensibility | Synonyms: beastly, bestial, brutal, brute |
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| brutishly | (adverb) in the manner of a beast | Synonyms: bestially, in a beastly manner |
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| bruxism | (noun) involuntarily or unconsciously clenching or grinding the teeth, typically during sleep | - |
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| bullrush | (noun) tall rush with soft erect or arching stems found in Eurasia, Australia, New Zealand, and common in North America | Synonyms: bulrush, common rush, Juncus effusus, soft rush |
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| (noun) tall marsh plant with cylindrical seed heads that explode when mature shedding large quantities of down; its long flat leaves are used for making mats and chair seats; of North America, Europe, Asia and North Africa | Synonyms: bulrush, cat's-tail, nailrod, reed mace, reedmace, Typha latifolia |
| bulrush | (noun) tall rush with soft erect or arching stems found in Eurasia, Australia, New Zealand, and common in North America | Synonyms: bullrush, common rush, Juncus effusus, soft rush |
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| (noun) tall marsh plant with cylindrical seed heads that explode when mature shedding large quantities of down; its long flat leaves are used for making mats and chair seats; of North America, Europe, Asia and North Africa | Synonyms: bullrush, cat's-tail, nailrod, reed mace, reedmace, Typha latifolia |
| bunyavirus | (noun) an animal virus belonging to the family Bunyaviridae; can be used as a bioweapon | - |
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| burunduki | (noun) terrestrial Siberian squirrel | Synonyms: baranduki, baronduki, barunduki, Eutamius asiaticus, Eutamius sibiricus |
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| buttercrunch | (noun) lettuce with delicate and relatively crunchy leaves | - |
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| candelabrum | (noun) branched candlestick; ornamental; has several lights | Synonyms: candelabra |
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| carborundum | (noun) an abrasive composed of silicon carbide crystals | - |
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| caruncle | (noun) an outgrowth on a plant or animal such as a fowl's wattle or a protuberance near the hilum of certain seeds | Synonyms: caruncula |
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