firefly

[ fahyuh r-flahy ]
/ ˈfaɪərˌflaɪ /

noun, plural fire·flies.

any nocturnal beetle of the family Lampyridae, characterized by a soft body with a light-producing organ at the rear of the abdomen.
Also called glowfly, lightning bug.
Compare glowworm.

Origin of firefly

First recorded in 1650–60; fire + fly2

Example sentences from the Web for firefly

British Dictionary definitions for firefly

firefly
/ (ˈfaɪəˌflaɪ) /

noun plural -flies

any nocturnal beetle of the family Lampyridae, common in warm and tropical regions, having luminescent abdominal organs See also glow-worm
any tropical American click beetle of the genus Pyrophorus, esp P. noctiluca, that have luminescent thoracic organs