<p><strong>Noun:</strong></p><ul><li>Any of various groups of mammallike reptiles of the extinct order Therapsida, inhabiting all continents from mid-Permian to late Triassic times, some of which were probably warm-blooded and directly ancestral to mammals.</li></ul><p><strong>Adjective:</strong></p><ul><li>Of or relating to the Therapsida.</li></ul>