/ Dictionary / Index L lunar rainbow: Meaning and Definition of Find definitions for: lu'nar rain'bow Pronunciation: [key] moonbow. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Lunar Orbiter lunar rover Related Content Daily Word Quiz: arboreal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language