water hemlock 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.
any of a genus (Cicuta) of perennial plants of the umbel family, with compound umbels of small white flowers and intensely poisonous, tuberous roots, found in the Northern Hemisphere in moist places
water hemlock definition by American Heritage Dictionary
Any of several poisonous, heavy-scented, perennial herbs of the genus Cicuta, especially C. maculata, of marshy areas in eastern and central North America, having compound umbels of small white flowers and bipinnately compound leaves.