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fireworm

[fahyuh r-wurm]
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noun
  1. the larva of any of several moths, as Rhopobota naevana (black-headed fireworm), which feeds on the leaves of cranberries and causes them to wither.
  2. glowworm.

Origin of fireworm

First recorded in 1560–70; fire + worm
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018