A poisonous European weed (Aethusa cynapium) in the parsley family, having finely divided leaves, umbels of small white flowers, and an unpleasant odor.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Plants) an evil-smelling Eurasian umbelliferous plant, Aethusa cynapium, with small white flowers: contains the poison coniine
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
an Old World fetid, poisonous weed, Aethusacynapium, of the parsley family.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.