glowworm glow-worm

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.

noun

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