/ Dictionary / Index L lady's-thistle: Meaning and Definition of Find definitions for: la•dy's-this•tle Pronunciation: (lā'dēz-this"ul), [key] — n. a composite plant, Silybum marianum, of the Mediterranean region, having glossy, spiny leaves and purplish-red flower heads. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: lady's-thistle (Thesaurus) lady's-slipper lady's-thumb Related Content Daily Word Quiz: confectionery Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language