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Meaning of Gila monster

Gi'la mon"ster

Pronunciation: [key]
  1. a large, venomous lizard, Heloderma suspectum, of the southwestern U.S. and northwestern Mexico, covered with beadlike scales of yellow, orange, and black.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.