dei·no·ther·i·um also di·no·ther·i·um 
(dī′nə-thîrē-əm)
(dī′nə-thîrē-əm)n.
Any of various extinct elephantlike mammals of the genus Deinotherium that existed during the Miocene, Pliocene, and Pleistocene Epochs.
[New Latin Dīnothērium, genus name : Greek deinos, monstrous + Greek thērion, wild beast; see TREACLE.]