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Meaning of pantothere

pan•to•there

Pronunciation: (pan'tu-thēr"), [key]
— n.
  1. any animal of the extinct order Pantotheria that lived during the late Mesozoic Era, believed to be the ancestor of the marsupial and placental mammals.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.