fluorescent
Americanadjective
-
possessing the property of fluorescence; exhibiting fluorescence.
-
strikingly bright, vivid, or glowing.
plastic toys in fluorescent colors.
noun
adjective
Other Word Forms
Etymology
Origin of fluorescent
Explanation
A fluorescent bulb gets its light from mercury vapor inside a glass tube. The incandescent bulb — the kind associated with Thomas Edison — has a filament that glows when it's heated. You can also use fluorescent to describe something that's so vivid and bright it seems to give off light. Fluorescent is related to the word fluorspar, or fluorite, which is a mineral that glows. Notice the -u- in these words. Fluorescent comes from the Latin fluere "to flow" — fluorspar can be added to welding compounds, for instance, to make them flow more easily. Florescent, without a -u-, means "flowering," from Latin flor-, which is a completely different root.
Vocabulary lists containing fluorescent
Frindle
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The Lemonade War
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The Marvels
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Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Not dramatically on sale, in the way of a holiday ham wearing a fluorescent sticker that announces some brief and glorious collapse in the market.
From Salon ● Aug. 25, 2026
A commenter branded it an example of “the Backrooms,” described as “nothing but the stink of old moist carpet, the madness of mono-yellow, the endless background noise of fluorescent lights at maximum hum-buzz.”
From The Wall Street Journal ● Jun. 6, 2026
To build the body maps, researchers first tagged nerves and immune cells in mice using fluorescent markers that glow under a microscope.
From Science Daily ● May 23, 2026
In the nine-minute short, a young cameraman falls into what appears to be an empty furniture store with an eerie atmosphere: a seemingly endless series of rooms covered in yellow wallpaper and buzzing fluorescent lights.
From Los Angeles Times ● May 14, 2026
Because if I ever get a rare disease that causes my butt to break out in fluorescent hives or something totally rando like that, I know Maddie’s the only one who could save me.
From "From Twinkle, with Love" by Sandhya Menon
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
