Hypertext Webster Gateway: "glowworm"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Glowworm \Glow"worm`\, n. (Zo["o]l.)
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.
Like a glowworm in the night, The which hath fire in
darkness, none in light. --Shak.
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}.
From WordNet (r) 1.7 (wn)
glowworm
n : the luminous larva or wingless grub-like female of a firefly
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