stag beetle

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Any of numerous large beetles of the family Lucanidae, the males of which have large, elaborately branched and toothed mandibles resembling the antlers of a stag.

from The Century Dictionary.

• noun A lamellicorn coleopterous insect of the genus Lucanus or restricted family Lucanidæ (which see), the males of which have branched mandibles resembling the antlers of a stag.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun Any of numerous large beetles of the family Lucanidae; the males have elaborate mandibles resembling the antlers of a stag; especially the species Lucanus cervus, which is the largest beetle in the UK.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a kind of lamellicorn beetle; the male has branched mandibles resembling antlers