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Any of various large scarab beetles of the subfamily Dynastinae chiefly of tropical regions, the males of which have horns on the head and thorax.
(Animals) any of various scarabaeid beetles having one or more horns on the head, esp Oryctes rhinoceros, a serious pest on coconut plantations
any of several scarabaeid beetles, esp. of the genus Dynastes, which comprises the largest beetles, characterized by one or more horns on the head and prothorax.