Definition of firefly in English:
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
- 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.
Definition of firefly in:
- US English dictionary