ragwort definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
Origin: see ragweed
ragwort definition by American Heritage Dictionary
Any of several plants of the very large genus Senecio in the composite family, having yellow flower heads, especially S. aureus of eastern North America. S. jacobaea, a European species poisonous to livestock, is widely naturalized in North America.
Origin: From the ragged shape of its leaves.