Firefly is a common name for a type of insect that makes light by burning fuel. Fireflies are found all over the world, and they are sometimes called "lights in the night."

  • I saw a bunch of fireflies near the river.

  • They put out a firefly light show every year at the park.

Definition of fireflies


nocturnal beetle common in warm regions having luminescent abdominal organs


lightning bug


tropical American click beetle having bright luminous spots


fire beetle, pyrophorus noctiluca

Nearby Words

fireflies Pronunciation in a video (3)

Example Sentences for fireflies

  • 1

    The Firefly lamp was glowing faintly in the dawn.

  • 2

    It is the flash of a firefly in the night.

  • 3

    Fireflies are illuminant in the dark.

  • 4

    Magic is the midnight twinkle of a firefly.

  • 5

    In this way the Scout is a cheaper alternative to the Firefly.

  • 6

    Still the cause of light of firefly is a mystery.

  • 7

    Fireflies congregate at the Berembang trees in the swamp.

  • 8

    Twinkle of a firefly in the midnight is amazing to watch.

  • 9

    Firefly is now classified as endangered species for contamination.

  • 10

    The color of light varies, depending on the type of firefly.