Bug

Part of speech: noun (n.)

1. A bugbear; anything which terrifies. [Obs.] Sir, spare your threats: The bug which you would fright me with I seek. Shak.

2. A general name applied to various insects belonging to the Hemiptera; as, the squash bug; the chinch bug, etc.

3. An insect of the genus Cimex, especially the bedbug (C. lectularius). See Bedbug.

4. One of various species of Coleoptera; as, the ladybug; potato bug, etc.; loosely, any beetle.

5. One of certain kinds of Crustacea; as, the sow bug; pill bug; bait bug; salve bug, etc.