'Hornbug' definitions:

Definition of 'Hornbug'

From: GCIDE

Hornbug \Horn"bug`\, n. (Zool.) A large nocturnal beetle of the genus Lucanus (as {Lucanus capreolus}, and Lucanus dama), having long, curved upper jaws, resembling a sickle. The grubs are found in the trunks of old trees. [1913 Webster]