Source : Webster's Revised Unabridged Dictionary (1913)

Agama \Ag"a*ma\, n.; pl. {Agamas}. [From the Caribbean name of a
   species of lizard.] (Zo["o]l.)
   A genus of lizards, one of the few which feed upon vegetable
   substances; also, one of these lizards.

Source : WordNet®

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