Source : Webster's Revised Unabridged Dictionary (1913)

Iguana \I*gua"na\, n. [Sp. iguana, from the native name in
   Hayti. Cf. {Guana}.] (Zo["o]l.)
   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.

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

Source : WordNet®

iguana
     n : 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}]