/ Dictionary / Index R ruby spinel: Meaning and Definition of Find definitions for: ru'by spinel" Pronunciation: [key] — Mineral. Mineral. a deep red, transparent variety of spinel, used as a gem. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ruby silver ruby-throated hummingbird Related Content Daily Word Quiz: clairvoyant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language