Glowworm
WordNet
noun
(1) The luminous larva or wingless grub-like female of a firefly
WiktionaryText
Noun
- The larva or wingless grub-like female of a beetle from the families Phengodidae or Lampyridae that gives out a green light from its abdomen.
- "The Glow-worm shews the Matin to be near, And gins to pale his uneffectual fire."http://www.archive.org/stream/tragedyhamletpr02shakgoog/tragedyhamletpr02shakgoog_djvu.txt