☆ 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
See cankerworm in American Heritage Dictionary 4
(kăngˈkər-wûrmˌ)
noun
The larva of either of two moths (Paleacrita vernata or Alsophila pometaria), destructive to fruit and shade trees.