WordNet (r) 3.0 (2006):

Adapid group
    n 1: 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 cousins [syn:
         Adapid, Adapid group]