fluo·​resce | \ flu̇-ˈres How to pronounce fluoresce (audio) , flȯ- \
fluoresced; fluorescing

Definition of fluoresce

intransitive verb

: to produce, undergo, or exhibit fluorescence

Keep scrolling for more

Other Words from fluoresce

fluorescer noun

Examples of fluoresce in a Sentence

Recent Examples on the Web That distantly related species of amphibians all fluoresced suggests that the trait likely developed early in amphibian evolution and may be quite widespread among the group. Joanna Klein, New York Times, "Salamanders and Frogs Hide a Glowing Secret," 27 Feb. 2020 But knowing a tiny amphibian might shine green among leaves that fluoresce red in blue light, could make surveys much easier. Joanna Klein, New York Times, "Salamanders and Frogs Hide a Glowing Secret," 27 Feb. 2020 As a control, Rober uses a blacklight to note which spots fluoresced before the students (who didn't know about the experiment) arrived. Isabel Garcia, House Beautiful, "This YouTuber Uses Glowing Powder to Show How Germs Spread," 26 Mar. 2020 Could this be why so few amphibians were known to fluoresce? Joanna Klein, New York Times, "Salamanders and Frogs Hide a Glowing Secret," 27 Feb. 2020 Researchers who survey disappearing populations of amphibians could make use of the trait to spot green-fluorescing salamanders in a jungle. Theresa Machemer, Smithsonian Magazine, "In Blue Light, Most Amphibians Have a Neon-Green Glow," 1 Mar. 2020 In 2015, National Geographic explorer David Gruber found that hawksbill sea turtles fluoresce green and red—the first biofluorescence ever recorded in a reptile. Michael Greshko, National Geographic, "These are the top 20 scientific discoveries of the decade," 5 Dec. 2019 Smaller species are more likely to fluoresce than larger ones. Smithsonian, "Amazing Photos Reveal the Hidden Light of Undersea Life," 25 July 2019 Those echoes will fluoresce in different ways depending on the atoms present in the sample. Jennifer Ouellette, Ars Technica, "Physicists discover hidden text in what was thought to be blank Egyptian papyri," 22 Aug. 2019

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'fluoresce.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

See More

First Known Use of fluoresce

1874, in the meaning defined above

History and Etymology for fluoresce

back-formation from fluorescence

Keep scrolling for more

Learn More about fluoresce

Time Traveler for fluoresce

Time Traveler

The first known use of fluoresce was in 1874

See more words from the same year

Statistics for fluoresce

Last Updated

22 May 2020

Cite this Entry

“Fluoresce.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/fluoresce. Accessed 29 May. 2020.

Keep scrolling for more

More Definitions for fluoresce

flu·​o·​resce | \ ˌflu̇(-ə)r-ˈes How to pronounce fluoresce (audio) , flōr- How to pronounce fluoresce (audio) , flȯr- How to pronounce fluoresce (audio) \
fluoresced; fluorescing

Medical Definition of fluoresce

: to produce, undergo, or exhibit fluorescence

Other Words from fluoresce

fluorescer noun

More from Merriam-Webster on fluoresce

Rhyming Dictionary: Words that rhyme with fluoresce

Comments on fluoresce

What made you want to look up fluoresce? Please tell us where you read or heard it (including the quote, if possible).


See Definitions and Examples »

Get Word of the Day daily email!

Test Your Vocabulary

May 2020 Words of the Day Quiz

  • a blooming wisteria tree
  • Which is a synonym of exiguous?
Spell It

Can you spell these 10 commonly misspelled words?


Test Your Knowledge - and learn some interesting things along the way.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!