This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. 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.

n. Extinct elephant-like mammal of the genus Mammut that flourished worldwide from Miocene through Pleistocene times; differs from elephants and mammoths in the form of the molar teeth.

n. An extinct genus of mammals closely allied to the elephant, but having less complex molar teeth, and often a pair of lower, as well as upper, tusks, which are incisor teeth. The species were mostly larger than elephants, and their remains occur in nearly all parts of the world in deposits ranging from Miocene to late Quaternary time.

n. An extinct proboscidean quadruped of the family Elephantidæ and subfamily Mastodontinæ.

n. [capitalized] The typical genus of Mastodontinæ, formerly held to include all the mastodons, now restricted to those of the tetralophodont series, such as M. avernensis of Europe.

n. extinct elephant-like mammal that flourished worldwide from Miocene through Pleistocene times; differ from mammoths in the form of the molar teeth

""You wouldn't have us call a mastodon like that Fanny, would you, or Tatters?""

proboscidean    proboscidian   

american mastodon    american mastodont    mammut americanum   

mastodonic   

bison    plesiosaurus    mylodon    narwhal    walrus    hippopotamus    caribou    mastodons    camelopard    agouti