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firefly

C2
noun

Pronunciation

UK

  • /fˈaɪəflaɪ/

US

  • /ˈfaɪərˌflaɪ/

Description

A firefly isn't actually a fly at all. It's a beetle famous for its soft glow. These little creatures use that light to attract mates, flashing unique patterns like tiny living signals in the dark. Imagine walking through a field on a warm summer night and seeing dozens of these twinkling lights. It can feel like stepping into a fairy tale. Fireflies are often linked with summer evenings, childhood memories, and a sense of wonder.

Fireflies aren't just beautiful; they're also important in nature. Their larvae often eat small soft-bodied animals such as snails, slugs, and worms. In many places, firefly numbers are falling because of habitat loss and light pollution, so protecting these glowing insects matters. You might also hear them called "lightning bugs" in some parts of the country, a friendly name for their quick flashes.

Examples

  1. 1

    Night insect

    A firefly landed on her sleeve as we walked home.

    • Meaning

      a firefly

      a small insect that gives off light at night

  2. 2

    Garden at dusk

    At dusk, the garden filled with fireflies.

  3. 3

    Seasonal habitat

    We usually see fireflies near the river in early summer.

See also

nouna small beetle that produces flashes of light

Similar

  • lightning bug
  • lampyrid

Shades of meaning

  • glowworm
  • bioluminescent beetle

Contrast

Used with (collocations)

  • fireflies flash
  • catch fireflies
  • firefly glow

Explore

Forms and spellings

2 forms open this card.

Main spelling

  • fireflynoun

Forms

  • firefliespluralnoun