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
Learn More about cankerworm
Britannica.com: Encyclopedia article about "cankerworm"
Seen and Heard
What made you want to look up cankerworm? Please tell us where you read or heard it (including the quote, if possible).