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 (măs′tə-dŏn′) also mas·to·dont (-dŏnt′)
Any of several very large, extinct proboscidian mammals of the family Mammutidae of the Miocene, Pliocene, and Pleistocene Epochs, resembling elephants but having molar teeth of a different structure.

[New Latin Mastodōn, genus name : Greek mastos, breast, nipple + Greek odōn, tooth (from the nipple-shaped protrusions on the crowns of its molars); see dent- in Indo-European roots.]

mas′to·don′ic adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.mastodont - extinct elephant-like mammal that flourished worldwide from Miocene through Pleistocene timesmastodont - extinct elephant-like mammal that flourished worldwide from Miocene through Pleistocene times; differ from mammoths in the form of the molar teeth
proboscidean, proboscidian - massive herbivorous mammals having tusks and a long trunk
genus Mammut, genus Mastodon, Mammut - extinct type genus of the Mammutidae: mastodons
American mastodon, American mastodont, Mammut americanum - mastodon of North America; in some classifications considered a mammoth rather than a mastodon
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
Mammoths, mastodonts, and elephants: biology, behavior, and fossil record.
This new fossil vertebrate assemblage was recovered from a test-pit excavation that includes 46 bird species (Steadman and Rincon, 2007); bats (Czaplewski et al., 2005); canids (Prevosti and Rincon, 2007); saber tooth cats (Rincon, 2006); equids (Rincon et al., 2006); armadillos, pampatheres, glyptodonts (Rincon et al., 2008); ground sloths, camelids, mastodonts (McDonald et al., 1999); and nine rodent species (Rincon, 2005).
Mammoths and mastodonts went extinct, as did the stocky dire wolves, giant short-faced bear, and to the west, fierce saber-toothed cats.
Stratigraphy.--The Shafer Mastodont Locality, like most of the other lakes and bogs that have yielded mastodonts in Indiana, is a shallow deposit of aquatic sediments that was truncated early in the Holocene.
All of the discussants at this yearly forum doubtlessly would agree that the most awesome and important members of the Pleistocene fauna are the mastodonts and mammoths, huge proboscideans (elephant-like beasts) that were the dominant members of the terrestrial community of the time.
Lucas & Effinger (1991) and Lucas & Morgan (1997) reviewed the published records and accessible museum collections of mammoths (genus Mammuthus) and mastodonts (Mammut americanum) from New Mexico, respectively (see also Harris 1993).
In South America, after colonizing this continent in the middle Pleistocene up until ~10,000 years ago, jaguars coexisted with the local large herbivorous community composed of giant ground sloth Megatherium, forest elephants Cuvieronius, mastodonts Stegomastodon, camel-like Macrauchenia, huge armadillos Glyptodon, wild horses Hippidion, and Toxodons, animals similar to hippopotamus or rhinos (Lessa and Farina, 1996; Turner and Anton, 1997; Alroy, 2001; Cione et al., 2003; Soibelzon et al., 2008).
This is the seminal paper on the mastodonts and mammoths of Michigan.