plural noun
Py·​ro·​the·​ria | \ ˌpīrōˈthirēə\

Definition of Pyrotheria

: an order of Paenungulata or in some classifications a suborder of Ungulata comprising large South American ungulates of Lower Tertiary age that have incisors like tusks and the cheek teeth all much alike and having two parallel transverse ridges

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History and Etymology for Pyrotheria

New Latin, pyr- + -theria

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a topic to which one constantly reverts

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