fluorescent

adjective

fluo·​res·​cent flu̇-ˈre-sᵊnt How to pronounce fluorescent (audio)
flȯ-
1
: having or relating to fluorescence
2
: bright and glowing as a result of fluorescence
fluorescent inks
broadly : very bright in color
fluorescent noun
fluorescently adverb

Examples of fluorescent in a Sentence

Recent Examples on the Web
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The makeshift detention center, surrounded by chain-link fences, had detainees sleeping on brown bunk beds under bright, perpetual fluorescent lights. Miami Herald, 31 Jan. 2026 Paint is peeling from the walls, the layout is awkward, and the atmosphere isn't helped by stark fluorescent lights and hospital-like tiles on the floor. Bebe Hodges, Cincinnati Enquirer, 30 Jan. 2026 Smith’s novel digital video fluorescence microscope was designed to take movies of neuronal activity using fluorescent light. Ingrid Wickelgren, Quanta Magazine, 30 Jan. 2026 UltraGreen holds an 85% market share in the US for its fluorescent dye used in surgical imaging, despite raising the average cost of its dye vials in the market by 60% and 30% in 2023 and 2024. Bernadette Toh, Bloomberg, 28 Jan. 2026 See All Example Sentences for fluorescent

Word History

First Known Use

1853, in the meaning defined at sense 1

Time Traveler
The first known use of fluorescent was in 1853

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Cite this Entry

“Fluorescent.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/fluorescent. Accessed 4 Feb. 2026.

Kids Definition

fluorescent

adjective
flu·​o·​res·​cent
ˌflu̇(-ə)r-ˈes-ᵊnt
1
: having or relating to fluorescence
2
: very bright in color
fluorescent markers

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