ultraviolet

adjective
ul·tra·vi·o·let | \ˌəl-trə-ˈvī-(ə-)lət \

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

Keep scrolling for more

Other Words from ultraviolet

ultraviolet noun

Examples of ultraviolet in a Sentence

Recent Examples on the Web

The orbiter’s main spectrometer, NOMAD, operates in the infrared, ultraviolet and visible parts of the electromagnetic spectrum. Nisha Gaind, Scientific American, "Mars Probe Poised to Solve Red Planet’s Methane Mystery," 26 Apr. 2018 The key components to this new method of detection are an ordinary smartphone, some special software downloaded onto the phone, a box made from Lego bricks, ultraviolet light, a standard 96-well test plate– and a special sauce, so to speak. Allison Barrie, Fox News, "Innovative project harnesses Legos and smartphones in the fight against invisible, deadly weapons," 13 July 2018 Free radicals are created by environmental pollutants and ultraviolet radiation. Talia Abbas, SELF, "I Had a Dermatologist Critique My Skin-Care Routine—and Here's What I'm Changing," 20 June 2018 Methane is also quickly broken down by ultraviolet radiation, so any of the gas discovered on Mars was probably released recently. Adam Mann, Scientific American, "Curiosity Rover Uncovers Long-Sought Organic Materials on Martian Surface," 7 June 2018 Because ultraviolet radiation and oxidizing compounds in the martian soil would destroy any compounds exposed at the surface, Curiosity's scientists used a robotic drill to penetrate several centimeters into the mudstone. Paul Voosen, Science | AAAS, "NASA rover hits organic pay dirt on Mars," 7 June 2018 Meanwhile, stricter approval standards in the U.S. have brought innovation to a standstill and limited options to defend against the sun's harmful ultraviolet radiation. Jack Kaskey, chicagotribune.com, "Your outdated sunscreen exposes you to needless cancer risk," 30 May 2018 The sun emits two types of ultraviolet radiation that reach the Earth: UVA and UVB, both of which damage DNA in the skin. Dr. Melina Jampolis, CNN, "Aging gracefully: Tightening your skin safely and effectively," 16 May 2018 Chromium also absorbs ultraviolet wavelengths of light, but re-emits some of it at a lower energy in the red wavelengths. C. Claiborne Ray, New York Times, "From One Mineral, Brilliant Reds and Bright Blues," 22 June 2018

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.

See More

First Known Use of ultraviolet

1840, in the meaning defined at sense 1

Keep scrolling for more

Learn More about ultraviolet

Share ultraviolet

Statistics for ultraviolet

Last Updated

27 Sep 2018

Look-up Popularity

Time Traveler for ultraviolet

The first known use of ultraviolet was in 1840

See more words from the same year

Keep scrolling for more

More Definitions for ultraviolet

ultraviolet

adjective

English Language Learners Definition of ultraviolet

—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 \

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 \

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

Keep scrolling for more

Comments on ultraviolet

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

WORD OF THE DAY

not any or not one

Get Word of the Day daily email!

Test Your Vocabulary

Great Scrabble Words—A Quiz

  • scrabble-tiles-that-read-scrabble-quiz
  • Which of the following Q-without-U words means the number five in cards or dice?
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
SCRABBLE® Sprint

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

TAKE THE QUIZ

Love words? Need even more definitions?

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