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Medical Dictionary


noun \ˈbəg\

Medical Definition of BUG

a :  an insect or other creeping or crawling invertebrate animal (as a spider)—not used technically b :  any of various insects commonly considered especially obnoxious: as (1) :  bedbug (2) :  cockroach (3) :  head louse c :  any of the order Hemiptera and especially of its suborder Heteroptera of insects that have sucking mouthparts, forewings thickened at the base, and that lack a pupal stage between the immature stages and the adult—called also true bug
a :  a disease-producing microorganism and especially a germ b :  a disease caused by such microorganisms; especially :  any of various respiratory conditions (as influenza or grippe) of virus origin
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