glow-worm

glowworm

[gloh-wurm]
noun
1.
the wingless female or larva of the European beetle, Lampyris noctiluca, which emits a sustained greenish light.
2.
any of various other beetle larvae or wingless females that emit a glow rather than a flash of light.

Origin:
1300–50; Middle English. See glow, worm

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World English Dictionary
glow-worm
 
n
1.  a European beetle, Lampyris noctiluca, the females and larvae of which bear luminescent organs producing a greenish light: family Lampyridae
2.  any of various other beetles or larvae of the family Lampyridae

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