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⇱ firefly - WordReference.com Dictionary of English

firefly

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UK:**UK and possibly other pronunciationsUK and possibly other pronunciations/ˈfaɪərflaɪ/US:USA pronunciation: IPA and respellingUSA pronunciation: IPA/ˈfaɪrˌflaɪ/ ,USA pronunciation: respelling(fīər′flī′)

Inflections of 'firefly' (n): npl: fireflies

WordReference Random House Learner's Dictionary of American English © 2026
fire•fly /ˈfaɪrˌflaɪ/USA pronunciation   n. [countable], pl. -flies. 
  1. Insectsa beetle that comes out at night, having a light-producing organ at the rear of the abdomen. Also called lightning bug. Compare glowworm.

WordReference Random House Unabridged Dictionary of American English © 2026
fire•fly  (fīər′flī′),USA pronunciation n., pl. -flies. 
  1. Insectsany 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. Cf. glowworm.
  • fire + fly2 1650–60

Collins Concise English Dictionary © HarperCollins Publishers::
firefly /ˈfaɪəˌflaɪ/ n ( pl -flies)
  1. any nocturnal beetle of the family Lampyridae, common in warm and tropical regions, having luminescent abdominal organs
    See also glow-worm
  2. any tropical American click beetle of the genus Pyrophorus, esp P. noctiluca, that have luminescent thoracic organs
'firefly' also found in these entries (note: many are not synonyms or translations):
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