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