any of various large chiefly herbivorous usually green or brownish tropical American lizards (family Iguanidae, the iguana family) that have a serrated dorsal crest and large dewlap; broadly : any of various large lizards
iguanas
noun(igua-na)
a shore-dwelling seaweed-eating iguana (Amblyrhynchus cristatus) of the Galápagos Islands that often feeds in the sea