Mastodon
WordNet
noun
(1) Extinct elephant-like mammal that flourished worldwide from Miocene through Pleistocene times; differ from mammoths in the form of the molar teeth
WiktionaryText
Etymology
First attested 1813, from the genus name Mastodon (1806), coined by Georges Cuvier, from + , from the similarity of the mammilloid projections on the crowns of the extinct mammal's molars.