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paraceratherium

American  
[par-uh-sar-uh-theer-ee-uhm] / ˌpær əˌsær əˈθɪər i əm /

noun

  1. a genus of extinct hornless mammals related to rhinoceroses, notable for being one of the largest land animals to ever exist.

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Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.