- mastodon, mastodont - extinct elephant-like mammal that flourished worldwide from Miocene through Pleistocene times; differ from mammoths in the form of the molar teeth
--1 is a kind of proboscidean, proboscidian
--1 is a member of Mammut, genus Mammut, genus Mastodon
--1 has particulars: American mastodon, American mastodont, Mammut americanum