/ Dictionary / Index R Rayleigh: Meaning and Definition of Find definitions for: Ray•leigh Pronunciation: (rā'lē), [key] 1842–1919, English physicist: Nobel prize 1904. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: rayleigh (Thesaurus) ray gun Rayleigh disk Related Content Daily Word Quiz: penchant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language