cankerworm
can·ker·worm [ ˈkaŋ-kər-ˌwərm]
[ˈkaŋ-kər-ˌwərm]
: either of two geometrid moths (Alsophila pometaria and Paleacrita vernata) and especially their larvae which are serious pests of fruit and shade trees First Known Use of cankerworm
1530, in the meaning defined above
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