1) Family uintatheriidae 2) Mammal family 
The Uintatheriidae is a family of extinct mammals that includes Uintatherium. They belong to the order Dinocerata, one of several extinct orders of primitive mammals that are sometimes united in the Condylarthra. Uintatheres were the largest land animals of their time, surviving from the late Paleocene into the Uintan Epoch of the Middle Eocene. T...
[n] - an extinct family of Dinocerata
family Uintatheriidae noun an extinct family of Dinocerata