'Gila monster' definitions:

Definition of 'Gila monster'

From: WordNet
noun
Large orange and black lizard of southwestern United States; not dangerous unless molested [syn: Gila monster, Heloderma suspectum]

Definition of 'Gila monster'

From: GCIDE
  • Gila monster \Gi"la mon"ster\ (Zool.) 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. [1913 Webster]