plural noun
Bron·​to·​the·​ri·​idae | \ˌbräntōthəˈrīəˌdē\

Definition of Brontotheriidae 

: a large family of extinct Eocene and Oligocene mammals (order Perissodactyla) that were widely distributed in the northern hemisphere and included the titanotheres and a number of related animals

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History and Etymology for Brontotheriidae

New Latin, from Brontotherium, type genus + -idae

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