cankerworm 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 several larvae of geometrid moths that are harmful to fruit and shade trees, esp. the spring cankerworm (Paleacrita vernata) that feeds on fruit and foliage
cankerworm definition by American Heritage Dictionary
The larva of either of two moths (Paleacrita vernata or Alsophila pometaria), destructive to fruit and shade trees.