Definition of "miacid"

The trenchant talonid is a character of some miacids and distinguishes these teeth from the hyaenodontids and oxyaenids.

1971, Thomas H. V. Rich, Deltatheridia, Carnivora, and Condylarthra (Mammalia) of the Early Eocene, Paris Basin, France

Miacids were long-bodied, had long tails, were pine marten sized or smaller, and some lived in trees while others spent their time on the ground.

2016 November 26, Elsa Panciroli, “Rifling through the 'wastebaskets' of palaeontology reveals surprises”, in The Guardian‎