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glowworm

[gloh-wurm] /ˈgloʊˌwɜrm/
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
1300-1350
1300-50; Middle English. See glow, worm
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples for glowworm
  • The glowworm glow is fainter than that of fireflies.

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