Iguana

noun

1. A green iguana (Iguana iguana), a large tropical American lizard often kept as a pet
2. In zoology, any member of the genus Iguana
3. Colloquially, in America and the Pacific, any of several members of the lizard family Iguanidae.
4. Colloquially, in Africa, any large member of the genus Varanus, especially the aquatic Nile monitor -- see leguan
5. Colloquially, in Australia, any member of the genus Varanus -- see goanna