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From The Collaborative International Dictionary of English v.0.48:
Glowworm \Glow"worm`\, n. (Zool.) A coleopterous insect of the genus Lampyris; esp., the wingless females and larv[ae] of the two European species (L. noctiluca, and L. splendidula), which emit light from some of the abdominal segments. [1913 Webster] Like a glowworm in the night, The which hath fire in darkness, none in light. --Shak. [1913 Webster] Note: The male is winged, and is supposed to be attracted by the light of the female. In America, the luminous larv[ae] of several species of fireflies and fire beetles are called glowworms. Both sexes of these are winged when mature. See Firefly. [1913 Webster]