/ Dictionary / Index D diamondback rattlesnake: Meaning and Definition of Find definitions for: dia'mondback rat'tlesnake Pronunciation: [key] either of two large, highly venomous rattlesnakes of the genus Crotalus, having diamond-shaped markings on the back. Cf. eastern diamondback rattlesnake, western diamondback rattlesnake. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. diamondback moth diamondback terrapin Related Content Daily Word Quiz: agitated Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language