Firefly definition

fīrflī
Frequency:
Any of a family (Lampyridae) of winged beetles, active at night, whose abdomens glow with a luminescent light.
noun
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Any of various nocturnal beetles of the family Lampyridae, characteristically having bioluminescent organs in the tip of the abdomen that produce a flashing light.
noun
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Any beetle of the family Lampyridae, which exhibit bioluminescence during twilight.
noun
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Other Word Forms

Noun

Singular:
firefly
Plural:
fireflies

Origin of firefly

  • From fire +‎ fly.

    From Wiktionary