Definition of "mastodon" [mas•to•don]

• Any of several very large, extinct proboscidian mammals of the genus Mammut (sometimes Mastodon), resembling the elephant but having molar teeth of a different structure. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• ""You wouldn't have us call a mastodon like that Fanny, would you, or Tatters?""
• "A mastodon is the more amazing animal too, isn't it?"
• "The mastodon was a relatively squat creature, standing certainly four feet shorter than the imperial elephant, with comparatively small and slightly curved tusks and a flatter head."