Meaning of lady's-thistle

la•dy's-this•tle

Pronunciation: (lā'dēz-this"ul), [key]
— n.
  1. 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.