n. - A bugbear; anything which terrifies.
n. - A general name applied to various insects belonging to the Hemiptera; as, the squash bug; the chinch bug, etc.
n. - An insect of the genus Cimex, especially the bedbug (C. lectularius). See Bedbug.
n. - One of various species of Coleoptera; as, the ladybug; potato bug, etc.; loosely, any beetle.
n. - One of certain kinds of Crustacea; as, the sow bug; pill bug; bait bug; salve bug, etc.