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pantothere

[pan-tuh-theer]
noun
  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.
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Origin of pantothere

< New Latin Pantotheria name of order, equivalent to panto- panto- + -theria, plural of -therium -there
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018