Definition of firefly in English:

firefly

Line breaks: fire|fly
Pronunciation: /ˈfʌɪəflʌɪ
 
/

noun (plural fireflies)

  • A soft-bodied beetle related to the glow-worm, the winged male and flightless female of which both have luminescent organs. The light is chiefly produced in flashes and typically functions as a signal between the sexes.
    • Family Lampyridae: many species, especially in the tropics, and including the European Luciola lusitanica
    More example sentences
    • Later lab experiments showed that by flashing an artificial light at a firefly you could speed up its rhythm, you could slow it down, make it flash a little later than it would otherwise.
    • We were guided as we went by millions of fireflies whose flashing marked the banks like landing lights on an airstrip.
    • The firefly's light is only visible for an instant.

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