'Caseworm' definitions:

Definition of 'caseworm'

(from WordNet)
noun
Insect larva that constructs a protective case around its body

Definition of 'Caseworm'

From: GCIDE
  • Caseworm \Case"worm`\, n. (Zool.) A worm or grub that makes for itself a case. See Caddice. [1913 Webster]