What does "hercules" mean?

Hercules: (Astron.) A constellation in the northern hemisphere, near Lyra. Hercules' beetle (Zoöl.), any species of Dynastes, an American genus of very large lamellicorn beetles, esp. D. hercules of South America, which grows to a length of six inches. -- Hercules' club. (Bot.) (a) An ornamental tree of the West Indies (Zanthoxylum Clava-Herculis), of the same genus with the prickly ash. (b) A variety of the common gourd (Lagenaria vulgaris). Its fruit sometimes exceeds five feet in length. (c) The Angelica tree. See under Angelica. -- Hercules powder, an explosive containing nitroglycerin; -- used for blasting.