ultraviolet

adjective
ul·​tra·​vi·​o·​let | \ ˌəl-trə-ˈvī-(ə-)lət How to pronounce ultraviolet (audio) \

Definition of ultraviolet

1 : situated beyond the visible spectrum at its violet end used of radiation having a wavelength shorter than wavelengths of visible light and longer than those of X-rays
2 : relating to, producing, or employing ultraviolet radiation

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Other Words from ultraviolet

ultraviolet noun

Examples of ultraviolet in a Sentence

Recent Examples on the Web

The natural fading of some slates isn’t likely to be the cause of your problem because that color change is triggered by ultraviolet light, Muehlbauer said. Jeanne Huber, Washington Post, "Restoring the color to slate that’s lost its blackness," 16 Sep. 2019 On the other side of the spectrum, there are spider silks that reflect ultraviolet light and appear blue at certain angles. Jason Bittel, National Geographic, "How spider silk is one of the most versatile materials on Earth," 12 Sep. 2019 An incident beam of red light will be reflected with strong blue and ultraviolet components. Chris Lee, Ars Technica, "Trampoline mirror may push laser pulse through fabric of the Universe," 14 Sep. 2019 But many scientists think the methane was destroyed by chemical reactions with Earth’s first ozone, produced when ultraviolet light from the sun struck the oxygen molecules. Eric Hand, Science | AAAS, "Shock and thaw? Earth’s oldest asteroid impact may have helped lift the planet out of a deep freeze," 27 Aug. 2019 These neutral atoms then absorbed the bright ultraviolet light coming from the first stars. Quanta Magazine, "Earliest Black Hole Gives Rare Glimpse of Ancient Universe," 6 Dec. 2017 Powerful ultraviolet radiation flares from red dwarfs could help uncover hidden biospheres throughout the galaxy by triggering a protective reaction from any lifeforms on exoplanets known as biofluorescence. David Grossman, Popular Mechanics, "If We're Ever Going to Find Aliens, It'll Be Because They Glow in the Dark," 23 Aug. 2019 Juvenile grayling are scheduled to arrive soon at the Oden State Fish Hatchery in Emmet County, where an ultraviolet water disinfection system recently was installed. USA TODAY, "Milestone rhino, Bigfoot shooting, jailed for feeding cats: News from around our 50 states," 1 Aug. 2019 Roughly 90% of the ozone in our atmosphere can be found between 15km and 35km above the Earth's surface, in a band that plays a crucial role in absorbing harmful ultraviolet sunlight. Cathleen O'grady, Ars Technica, "While ozone is recovering, we’re doing things to prolong the process," 30 July 2019

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

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First Known Use of ultraviolet

1840, in the meaning defined at sense 1

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Statistics for ultraviolet

Last Updated

11 Oct 2019

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Time Traveler for ultraviolet

The first known use of ultraviolet was in 1840

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More Definitions for ultraviolet

ultraviolet

adjective

English Language Learners Definition of ultraviolet

technical used to describe rays of light that cannot be seen and that are slightly shorter than the rays of violet light

ultraviolet

adjective
ul·​tra·​vi·​o·​let | \ ˌəl-trə-ˈvī-ə-lət How to pronounce ultraviolet (audio) \

Kids Definition of ultraviolet

: relating to, producing, or being energy that is like light but has a slightly shorter wavelength and lies beyond the violet end of the spectrum

ultraviolet

adjective
ul·​tra·​vi·​o·​let | \ ˌəl-trə-ˈvī-(ə-)lət How to pronounce ultraviolet (audio) \

Medical Definition of ultraviolet

 (Entry 1 of 2)

1 : situated beyond the visible spectrum at its violet end used of radiation having a wavelength shorter than wavelengths of visible light and longer than those of X-rays
2 : relating to, producing, or employing ultraviolet radiation

ultraviolet

noun

Medical Definition of ultraviolet (Entry 2 of 2)

: ultraviolet radiation

More from Merriam-Webster on ultraviolet

Rhyming Dictionary: Words that rhyme with ultraviolet

Spanish Central: Translation of ultraviolet

Nglish: Translation of ultraviolet for Spanish Speakers

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