Gila monster

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A large stocky venomous lizard (Heloderma suspectum) of the southwest United States and western Mexico, having black and orange, pink, or yellowish beadlike scales.

from The Century Dictionary.

• See monster.

from the GNU version of the Collaborative International Dictionary of English.

• (Zoöl.) A large tuberculated lizard (Heloderma suspectum) native of the dry plains of Arizona, New Mexico, etc. It is the only lizard known to have venomous teeth.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun a venomous lizard, Heloderma suspectum, that lives in the deserts of the southwestern USA and northwestern Mexico

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun large orange and black lizard of southwestern United States; not dangerous unless molested