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mas·to·don(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.]
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.
very large and powerful
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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Of extraordinary size and power:
behemoth, Brobdingnagian, Bunyanesque, colossal, cyclopean, elephantine, enormous, gargantuan, giant, gigantesque, gigantic, herculean, heroic, huge, immense, jumbo, mammoth, massive, massy, mighty, monster, monstrous, monumental, mountainous, prodigious, pythonic, stupendous, titanic, tremendous, vast.
The American Heritage® Roget's Thesaurus. Copyright © 2013, 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.