Definition of Gila monster
: a large, stout, venomous lizard (Heloderma suspectum) that has rough, bumpy, black and orange, pinkish, or yellowish skin, a thick tail, and venom glands in the lower lip and that is found especially in arid regions of the southwestern U.S. and northwestern Mexico
Origin and Etymology of gila monster
Gila River, Arizona
First Known Use: 1877
GILA MONSTER Defined for English Language Learners
Definition of Gila monster for English Language Learners
: a large orange and black poisonous lizard of the southwestern U.S.
Medical Definition of Gila monster
: a large orange and black venomous lizard of the genus Heloderma (H. suspectum) of the southwestern United States
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Britannica.com: Encyclopedia article about Gila monster
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