fluorescence

noun

fluo·​res·​cence flu̇-ˈre-sᵊn(t)s How to pronounce fluorescence (audio)
flȯ-
: luminescence that is caused by the absorption of radiation at one wavelength followed by nearly immediate reradiation usually at a different wavelength and that ceases almost at once when the incident radiation stops
also : the radiation emitted compare phosphorescence

Examples of fluorescence in a Sentence

studied the fluorescence of certain elements
Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Using portable X-ray fluorescence, a nondestructive way to identify geochemical fingerprints, the researchers confirmed that the Mexicas were partial to a particular green and golden obsidian to produce items for rituals. Ashley Strickland, CNN Money, 16 May 2025 Showoff How the birds move can also affect the way their fluorescence shows up. Elizabeth Rayne, Ars Technica, 23 Feb. 2025 At 4-0 down, the PSG ultras, bathed in the pink fluorescence of their flares, serenaded every touch of their team with an ‘Ole’. James Horncastle, New York Times, 2 June 2025 The show features vibrant paintings created with unusual color combinations in fluorescence and neon not typically found in nature. Julie Gallant, San Diego Union-Tribune, 6 May 2025 See All Example Sentences for fluorescence

Word History

Etymology

fluorspar + opalescence

First Known Use

1852, in the meaning defined above

Time Traveler
The first known use of fluorescence was in 1852

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Cite this Entry

“Fluorescence.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/fluorescence. Accessed 24 Jun. 2025.

Kids Definition

fluorescence

noun
flu·​o·​res·​cence
ˌflu̇(-ə)r-ˈes-ᵊn(t)s
: the giving off of radiation usually as visible light when exposed to radiation from another source (as ultraviolet light)
also : the radiation given off

Medical Definition

fluorescence

noun
flu·​o·​res·​cence -ˈes-ᵊn(t)s How to pronounce fluorescence (audio)
: luminescence that is caused by the absorption of radiation at one wavelength followed by nearly immediate reradiation usually at a different wavelength and that ceases almost immediately when the incident radiation stops
also : the radiation emitted
fluorescent adjective
fluorescently adverb

More from Merriam-Webster on fluorescence

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