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The Collaborative International Dictionary
Copperworm

Copperworm \Cop"per*worm`\, n. (Zo["o]l.)

  1. The teredo; -- so called because it injures the bottoms of vessels, where not protected by copper.

  2. The ringworm.

Wiktionary
copperworm

n. 1 The teredo. 2 The ringworm.