condylarth

Etymology

From the (disused) order name Condylarthra, from Ancient Greek κόνδυλος (kóndulos, “knuckle”) + ἄρθρον (árthron, “joint”).

noun

Any of a group of extinct placental mammals, early ungulates, known from the Paleocene and Eocene epochs.“In the 10 million years after the mass extinction, the first perissodactyls emerged from the confused wastebasket of animals called condylarths.”