| Noun | 1. | Adapid - extinct small mostly diurnal lower primates that fed on leaves and fruit; abundant in North America and Europe 30 to 50 million years ago; their descendents probably include the lemurs; some authorities consider them ancestral to anthropoids but others consider them only cousinsorder Primates, Primates - an animal order including lemurs and tarsiers and monkeys and apes and human beings | |