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Any luminous winged insect, esp. luminous beetles of the family Lampyridæ.

and South America; -- called also cucujo. The name is also applied to other species. See Firefly.

Any winged insect; esp., one with transparent wings; as, the Spanish fly; firefly; gall fly; dragon fly.

umps. Called also lightning discharger. -- Lightning bug (Zoöl.), a luminous beetle. See Firefly. -- Lightning conductor, a lightning rod. -- Lightning glance, a quick, penetrating glance of a brilliant eye. -- Lightning rod, a metallic rod set up on a building, or on the mast of a vessel, and connected with the ea…

The faculty or power of voluntarily producing light, as in the firefly and glowworm.