Bug

·noun A bugbear; anything which terrifies.

II. Bug ·noun One of certain kinds of Crustacea; as, the sow bug; pill bug; bait bug; salve bug, ·etc.

III. Bug ·noun One of various species of Coleoptera; as, the ladybug; potato bug, ·etc.; loosely, any beetle.

IV. Bug ·noun An insect of the genus Cimex, especially the bedbug (C. lectularius). ·see Bedbug.

V. Bug ·noun A general name applied to various insects belonging to the Hemiptera; as, the squash bug; the chinch bug, ·etc.