IPA: /ˈkæŋkərˌwɜːrm/
KK: /ˈkæŋkərˌwɜrm/
A type of caterpillar that comes from certain moths and is known to damage fruit and shade trees.
The cankerworm caused significant damage to the apple orchard this spring.
Cankerworm is formed from "canker" (from Old English "cancor", meaning a sore or ulcer) and "worm" (from Old English "wyrm", meaning serpent or worm). The term refers to a type of caterpillar that can cause damage to plants, resembling a sore or infestation.
Think of a 'sore' ('canker') that is like a 'worm' — this helps you remember that a cankerworm is a caterpillar that can harm plants.