fireflies

firefly

[fahyuhr-flahy]
noun, plural fireflies.
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:
1650–60; fire + fly2

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World English Dictionary
firefly (ˈfaɪəˌflaɪ)
 
n , pl -flies
1.  See also glow-worm any nocturnal beetle of the family Lampyridae, common in warm and tropical regions, having luminescent abdominal organs
2.  any tropical American click beetle of the genus Pyrophorus, esp P. noctiluca, that have luminescent thoracic organs

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

firefly
1650s, from fire + fly.
Online Etymology Dictionary, © 2010 Douglas Harper
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