club root 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.
a disease of plants of the cabbage family, caused by a slime mold (Plasmodiophora brassicae) and characterized by swellings of the roots
club root definition by American Heritage Dictionary
A disease of cabbage and related plants, caused by a fungus (Plasmodiophora brassicae) and characterized by knobby or club-shaped swellings on the roots and wilting, yellowing, and stunted growth of aboveground parts.