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Comprehensive
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bacteriology the science that is concerned with bacteria.
bacteriophage any virus that attacks and kills bacteria.
bacterium any of a large group of one-celled microscopic organisms of various shapes that are often agents of fermentation and putrefaction and that may cause disease.
Bactrian camel a two-humped camel that is native to central Asia and that is stockier and hairier than an Arabian camel. (Cf. dromedary.)
bad of low quality or desirability; unsatisfactory. [9 definitions]
bad apple one exceptional member of a group who behaves badly and causes trouble for all the other members of the group or makes the others look bad.
bad blood animosity between two or more people; mutual hostility.
bade a past tense of bid.
badge a piece of metal, cloth, or other material worn to signify a particular membership, rank, occupation, or accomplishment. [3 definitions]
badger any of several carnivorous, short-legged mammals that burrow in the ground. [3 definitions]
bad guy (informal) the villain or enemy in a fictional story. [4 definitions]
bad-humored having or showing an unpleasant or ill-tempered nature or mood.
badinage playful conversation marked by joking or teasing; banter. [2 definitions]
badlands a barren region characterized by rock that has eroded into unusual shapes.
badly in a poor or incorrect manner; not well; poorly. [4 definitions]
badman an outlaw, desperado, bandit, or the like, esp. in the old American West.
badminton a sport in which players use light, long-handled rackets to propel a shuttlecock back and forth across a high net.
badmouth (informal) to speak of in critical, unfair, or slanderous terms.
bad-tempered having a bad temper or mood; cranky; irritable.
Baedeker any of a series of travelers' guidebooks published by Karl Baedeker and his successors.
baffle to bewilder; confuse. [4 definitions]