Cankerworm Definition
 kăngkər-wûrm 
    noun
  
 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.
 Webster's New World 
(figuratively) A corrupting or destructive force.
Wiktionary 
Other Word Forms of Cankerworm
Noun
Singular:
 cankerwormPlural:
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