Meaning of “firefly” in the English Dictionary

british dictionary

"firefly" in British English

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fireflynoun [ C ]

uk /ˈfaɪə.flaɪ/ us /ˈfaɪr.flaɪ/


  • Fireflies and glowworms make light to protect themselves.
  • Glowworms make light to scare other animals, and some fireflies make light to show they aren’t good to eat.

(Definition of “firefly” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"firefly" in American English

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fireflynoun [ C ]

us /ˈfɑɪərˌflɑɪ/ also lightning bug

a small insect that produces flashes of light when it flies at night

(Definition of “firefly” from the Cambridge Academic Content Dictionary © Cambridge University Press)

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