Definition of iguanas:
(n) :
A green iguana (Iguana iguana), a large tropical American lizard often kept as a pet.
(n) :
(zoology) Any member of the genus Iguana.
(n) :
(colloquial) In America and the Pacific, any of several members of the lizard family Iguanidae.
(n) :
(colloquial) In Africa, any large member of the genus Varanus, especially the aquatic Nile monitor (see leguan).
(n) :
(Australia, formerly) Any member of the genus Varanus (see goanna).