The Collaborative International Dictionary of English v.0.48:
Hercules \Her"cu*les\, n.
1. (Gr. Myth.) A hero, fabled to have been the son of Jupiter
and Alcmena, and celebrated for great strength, esp. for
the accomplishment of his twelve great tasks or "labors."
2. (Astron.) A constellation in the northern hemisphere, near
Hercules' beetle (Zool.), any species of Dynastes, an
American genus of very large lamellicorn beetles, esp.
Dynastes hercules of South America, which grows to a
length of six inches.
Hercules powder, an explosive containing nitroglycerin; --
used for blasting.
[1913 Webster] Hercules'-club