n. Any of various monitor lizards native to Australia.
The Century Dictionary and Cyclopedia
n. A popular variant of guana (an abbreviated form of iguana) in common use in Australia for any large lizard; specifically, the lace-lizard, Varanus varius. Also gohanna.
Word Usage
"S. IRWIN: It's a goanna, which is a big -- will actually grow to be the biggest lizard species in the world."