|1.||either of two large tropical American arboreal herbivorous lizards of the genus Iguana, esp I. iguana (common iguana), having a greyish-green body with a row of spines along the back: family Iguanidae|
|2.||Also called: iguanid any other lizard of the tropical American family Iguanidae|
|3.||another name for leguaan|
|[C16: from Spanish, from Arawak iwana]|
"Foure footed beastes ... named Iuannas, muche lyke vnto Crocodiles, of eyght foote length, of moste pleasaunte taste." [Richard Eden, "Decades of the New World," 1555]Dinosaur name Iguanodon is 1830, from iguana + stem of Gk. odonys "tooth," on model of mastodon; so called because the fossil teeth and bones were thought to resemble those of the lizard.