The Collaborative International Dictionary of English v.0.48:

Iguanid \I*gua"nid\, a. (Zool.)
   Same as Iguanoid.
   [1913 Webster]

WordNet (r) 3.0 (2006):

iguanid
    n 1: lizards of the New World and Madagascar and some Pacific
         islands; typically having a long tail and bright throat
         patch in males [syn: iguanid, iguanid lizard]