caseworm

from WordNet (r) 3.0 (2006)
caseworm
    n 1: insect larva that constructs a protective case around its
         body
from The Collaborative International Dictionary of English v.0.48
Caseworm \Case"worm`\, n. (Zool.)
   A worm or grub that makes for itself a case. See {Caddice}.
   [1913 Webster]
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