bug

bug

noun \ˈbəg\

Definition of BUG

1

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

2

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