Lightning bug

noun

Definitions

Noun
  1. 1
    A firefly.

    "I watched as lightning bugs drifted in, glowing yellow against the shadows."

  2. 2
    nocturnal beetle common in warm regions having luminescent abdominal organs wordnet

Etymology

From lightning + bug, because the insects glow; whence also firefly. Compare glow fly, glowworm, and lanternfly.

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