Definitions of cankerworm
  1. noun
    green caterpillar of a geometrid moth; pest of various fruit and shade trees
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    spring cankerworm
    variably colored looper; larva of Paleacrita vernata
    fall cankerworm
    green or brown white-striped looper; larva of Alsophila pometaria
    type of:
    a wormlike and often brightly colored and hairy or spiny larva of a butterfly or moth
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