The Collaborative International Dictionary of English v.0.48:

Agama \Ag"a*ma\ ([a^]g"[.a]*m[.a]), n.; pl. Agamas
   ([a^]g"[.a]*m[.a]z). [From the Caribbean name of a species of
   lizard.] (Zool.)
   A genus of lizards, one of the few which feed upon vegetable
   substances; also, one of these lizards.
   [1913 Webster]

WordNet (r) 3.0 (2006):

agama
    n 1: small terrestrial lizard of warm regions of the Old World