dei·no·ther·i·um also di·no·ther·i·um (dī′nə-thîrē-əm)
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.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.