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
Rangers lead synchronous firefly viewing tours in the late summer to help travelers safely watch as nature’s magic unfolds.
—
Stephanie Vermillion, Travel + Leisure, 9 May 2026
The fireflies thrive in hardwood forest environments, like Grandfather Mountain.
—Eva Flowe
may 6, Charlotte Observer, 6 May 2026
After dinner, kids ran on the main lawn catching fireflies.
—Erika Ebsworth-Goold, Midwest Living, 6 May 2026
The rooms Guest room hallways preview the property’s design point of view: blonde wood floors, blue-and-white striped carpet, and sage doors topped with brass knockers shaped like clams, crabs, fireflies, seahorses, and more.
—Condé Nast, Condé Nast Traveler, 23 Apr. 2026
See All Example Sentences for firefly
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Stephanie Vermillion, Travel + Leisure, 9 May 2026
The fireflies thrive in hardwood forest environments, like Grandfather Mountain.
—Eva Flowe
may 6, Charlotte Observer, 6 May 2026
After dinner, kids ran on the main lawn catching fireflies.
—Erika Ebsworth-Goold, Midwest Living, 6 May 2026
The rooms Guest room hallways preview the property’s design point of view: blonde wood floors, blue-and-white striped carpet, and sage doors topped with brass knockers shaped like clams, crabs, fireflies, seahorses, and more.
—Condé Nast, Condé Nast Traveler, 23 Apr. 2026
See All Example Sentences for firefly
Cite this Entry
“Firefly.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/firefly. Accessed 20 May. 2026.
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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