Iguana

from WordNet (r) 3.0 (2006)

iguana
    n 1: large herbivorous tropical American arboreal lizards with a
         spiny crest along the back; used as human food in Central
         America and South America [syn: {common iguana}, {iguana},
         {Iguana iguana}]

from The Collaborative International Dictionary of English v.0.48

Iguana \I*gua"na\, n. [Sp. iguana, from the native name in
   Haiti. Cf. {Guana}.] (Zool.)
   Any species of the genus {Iguana}, a genus of large American
   lizards of the family {Iguanid[ae]}. They are arboreal in
   their habits, usually green in color, and feed chiefly upon
   fruits.
   [1913 Webster]

   Note: The common iguana ({Iguana tuberculata}) of the West
         Indies and South America is sometimes five feet long.
         Its flesh is highly prized as food. The horned iguana
         ({Iguana cornuta}) has a conical horn between the eyes.
         [1913 Webster]