(Science: zoology) hercules beetle, any species of Dynastes, an American genus of very large lamellicorn beetles, especially. D. Hercules of south America, which grows to a length of six inches. Hercules club.
(Science: botany) An ornamental tree of the west indies (Zanthoxylum Clava-Herculis), of the same genus with the prickly ash. A variety of the common gourd (Lagenaria vulgaris). Its fruit sometimes exceeds five feet in length. The angelica tree. See angelica. Hercules powder, an explosive containing nitroglycerin; used for blasting.