Illustration of firefly
firefly
noun
fire·fly
ˈfī(-ə)r-ˌflī 
: any of various winged nocturnal beetles (especially family Lampyridae) that produce a bright soft intermittent light by oxidation of luciferin especially for courtship purposes
Examples of firefly in a Sentence
Recent Examples on the Web
Threats facing fireflies Fireflies need moisture in each of their life cycles, Lewis said.
—
Aliza Chasan, CBS News, 7 June 2024
Submit your firefly observations to help project scientists monitor populations of these extraordinary insects.
—Bob Hirshon, Discover Magazine, 6 June 2024
Seeing synchronous fireflies is a rare, ephemeral treat.
—Pien Huang, NPR, 26 May 2024
There was no better promise of the upcoming months of lakeside walks, dewy mornings in the garden, and twilights spent chasing fireflies to the soundtrack of peeping tree frogs.
—Lily Stewart, The Christian Science Monitor, 10 May 2024
See all Example Sentences for firefly 
Aliza Chasan, CBS News, 7 June 2024
Submit your firefly observations to help project scientists monitor populations of these extraordinary insects.
—Bob Hirshon, Discover Magazine, 6 June 2024
Seeing synchronous fireflies is a rare, ephemeral treat.
—Pien Huang, NPR, 26 May 2024
There was no better promise of the upcoming months of lakeside walks, dewy mornings in the garden, and twilights spent chasing fireflies to the soundtrack of peeping tree frogs.
—Lily Stewart, The Christian Science Monitor, 10 May 2024
See all Example Sentences for firefly
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“Firefly.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/firefly. Accessed 12 Jun. 2024.
Copy CitationKids Definition
firefly
noun
fire·fly
ˈfī(ə)r-ˌflī
: any of numerous night-flying beetles that produce a bright soft flashing light for courtship purposes
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