Noun
nimravid (plural nimravids)
Any of the large extinct feliforms of the family Nimravidae, of the Middle to Late Miocene (40—7 million years ago).
The hypercarnivorous (strictly meat-eating) nimravid feliforms were extinct in North America after 26 mya and felids did not arrive in North America until the early middle Miocene (16 mya). Source: Internet
Recognizable nimravid fossils date from the late Eocene (37 mya), from the Chadronian White River Carnivora Formation at Flagstaff Rim, Wyoming. Source: Internet