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Webster 1913 Edition

Noun.

(Zool.)

The larva of a small tortricid moth which eats the leaves of the cranberry, so that the vines look as if burned; – called also

cranberry worm

fireworm ‎(plural fireworms)

Chloeia flava

The larva of any of several tortricid moths (family Tortricidae).
1. The larva of a small tortricid moth that feeds on cranberry leaves, giving the plant a burnt look; the cranberry worm.
The bearded fireworm, Chloeia flava, a species of polychaete, in family Amphinomidae, which may cause pain if touched.