/ Dictionary / Index M monarch butterfly: Meaning and Definition of Find definitions for: mon'arch but"terfly Pronunciation: [key] a large, deep-orange butterfly, Danaus plexippus, having black and white markings, the larvae of which feed on the leaves of milkweed. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. monarchal Monarchianism Related Content Daily Word Quiz: pertinent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language