pantothere

\\ˈpantəˌthi(ə)r\ noun (-s)

Etymology: New Latin Pantotheria

: a mammal or fossil of the order Pantotheria

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/pan"teuh thear'/, n.

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.

[ < NL Pantotheria name of order, equiv. to panto- PANTO- + -theria, pl. of -therium -THERE]