cankerworm

noun
can·ker·worm | \ˈkaŋ-kər-ˌwərm \

Definition of cankerworm 

: 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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The first known use of cankerworm was in 1530

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