Mesonychidae
plural noun
Mes·onych·i·dae
ˌme|zōˈnikəˌdē,
ˌmē|,
|sō-
: a family of extinct creodont carnivorous mammals from the Paleocene and Eocene of North America and Europe
Word History
Etymology
New Latin, from Mesonych-, Mesonyx, type genus + -idae