WordNet (r) 3.0 (2006):

Omomyid group
    n 1: extinct tiny nocturnal lower primates that fed on fruit and
         insects; abundant in North America and Europe 30 to 50
         million years ago; probably gave rise to the tarsiers; some
         authorities consider them ancestral to anthropoids but
         others consider them only cousins [syn: Omomyid, Omomyid
         group]