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
Installations range from California poppies and a field of fireflies to a laser garden.
—
Linda McIntosh, San Diego Union-Tribune, 24 Dec. 2025
Alternatively, consider timing your trip for the firefly season, which begins in mid-March and runs for about a month.
—Lydia Mansel, Travel + Leisure, 20 Dec. 2025
The South is filled with gorgeous locations like autumn in the Smoky Mountains, leafy drives in the Shenandoahs, the Garden District in New Orleans, ogling the stars in the Texas llano, sunrise in the Florida Keys, or watching the fireflies in Congaree National Park.
—Melissa Locker, Southern Living, 11 Dec. 2025
Someday, my kid will say that about me and fireflies.
—Fiction Non Fiction, Literary Hub, 13 Nov. 2025
See All Example Sentences for firefly
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Linda McIntosh, San Diego Union-Tribune, 24 Dec. 2025
Alternatively, consider timing your trip for the firefly season, which begins in mid-March and runs for about a month.
—Lydia Mansel, Travel + Leisure, 20 Dec. 2025
The South is filled with gorgeous locations like autumn in the Smoky Mountains, leafy drives in the Shenandoahs, the Garden District in New Orleans, ogling the stars in the Texas llano, sunrise in the Florida Keys, or watching the fireflies in Congaree National Park.
—Melissa Locker, Southern Living, 11 Dec. 2025
Someday, my kid will say that about me and fireflies.
—Fiction Non Fiction, Literary Hub, 13 Nov. 2025
See All Example Sentences for firefly
Cite this Entry
“Firefly.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/firefly. Accessed 28 Dec. 2025.
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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