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[mas-tuh-don] /ˈmæs təˌdɒn/

a massive, elephantlike mammal of the genus Mammut (Mastodon), that flourished worldwide from the Miocene through the Pleistocene epochs and, in North America, into recent times, having long, curved upper tusks and, in the male, short lower tusks.
a person of immense size, power, influence, etc.
any extinct elephant-like proboscidean mammal of the genus Mammut (or Mastodon), common in Pliocene times

1813, from Modern Latin genus name Mastodon (1806), coined by French naturalist Georges Léopole Chrétien Frédéric Dagobert, Baron Cuvier (1769-1832) from Greek mastos “breast” (see masto-) + -odon “tooth” (see tooth); so called from the nipple-like projections on the crowns of the extinct mammal’s fossil molars. Related: Mastodontic.
Any of several extinct mammals of the genus Mastodon (or Mammut). Mastodons resembled elephants and mammoths except that their molar teeth had conelike cusps rather than parallel ridges for grinding. Like elephants, mastodons had a pair of long, curved tusks growing from their upper jaw, but males also sometimes had a second pair from the lower jaw. Like mammoths, mastodons were covered with hair. They lived from the Oligocene Epoch to the end of the Ice Age.


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  • Mastoid

    [mas-toid] /ˈmæs tɔɪd/ adjective, Anatomy. 1. of or relating to the . 2. resembling a breast or nipple. noun 3. the . /ˈmæstɔɪd/ adjective 1. shaped like a nipple or breast 2. designating or relating to a nipple-like process of the temporal bone behind the ear noun 3. the mastoid process 4. (informal) mastoiditis adj. […]

  • Mastoid antrum

    mastoid antrum n. A cavity in the petrous portion of the temporal bone that communicates with the mastoid sinuses and epitympanic recess of the middle ear. Also called tympanic antrum.

  • Mastoid canaliculus

    mastoid canaliculus n. The canal that extends from the jugular fossa through the mastoid process and transmits the auricular branch of the vagus nerve.

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