firefly


noun, plural fire·flies.

  1. any nocturnal beetle of the family Lampyridae, characterized by a soft body with a light-producing organ at the rear of the abdomen.

noun plural -flies

  1. any nocturnal beetle of the family Lampyridae, common in warm and tropical regions, having luminescent abdominal organsSee also glow-worm
  2. any tropical American click beetle of the genus Pyrophorus, esp P. noctiluca, that have luminescent thoracic organs
n.

1650s, from fire (n.) + fly (n.).

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