Here you will find one or more explanations in English for the word Copperworm.
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Copperworm
Copperworm Cop"per*worm`, n. (Zo["o]l.)
(a) The teredo; -- so called because it injures the bottoms
of vessels, where not protected by copper.
(b) The ringworm.
Meaning of Copperworm from wikipedia