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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]