ultraviolet
adjective
ul·tra·vi·o·let
ˌəl-trə-ˈvī-(ə-)lət 
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
Examples of ultraviolet in a Sentence
Recent Examples on the Web
Instead, their isotopic composition matches what could be expected from having formed in a chemically distinct and frozen environment farther from the sun, though still dowsed in the solar ultraviolet radiation required to trigger the reaction to form the amino acids.
—
Keith Cooper, Space.com, 11 Feb. 2026
This was made possible by its optical seeker, which used infrared and ultraviolet sensors to lock onto targets without being confused by background clutter.
—David Szondy
february 08, New Atlas, 8 Feb. 2026
The short wavelength means the ultraviolet light carries more energy, thus enabling new applications.
—Georgina Jedikovska, Interesting Engineering, 4 Feb. 2026
Some of those risk factors include tobacco use, alcohol consumption, high body mass index, insufficient physical activity, air pollution, ultraviolet radiation and infections like hepatitis B, hepatitis C, Epstein–Barr virus and human papillomavirus, or HPV.
—Sara Moniuszko, USA Today, 4 Feb. 2026
See All Example Sentences for ultraviolet
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Keith Cooper, Space.com, 11 Feb. 2026
This was made possible by its optical seeker, which used infrared and ultraviolet sensors to lock onto targets without being confused by background clutter.
—David Szondy
february 08, New Atlas, 8 Feb. 2026
The short wavelength means the ultraviolet light carries more energy, thus enabling new applications.
—Georgina Jedikovska, Interesting Engineering, 4 Feb. 2026
Some of those risk factors include tobacco use, alcohol consumption, high body mass index, insufficient physical activity, air pollution, ultraviolet radiation and infections like hepatitis B, hepatitis C, Epstein–Barr virus and human papillomavirus, or HPV.
—Sara Moniuszko, USA Today, 4 Feb. 2026
See All Example Sentences for ultraviolet
Cite this Entry
“Ultraviolet.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/ultraviolet. Accessed 16 Feb. 2026.
Copy CitationKids Definition
ultraviolet
adjective
ul·tra·vi·o·let
ˌəl-trə-ˈvī-ə-lət
1
: located beyond the visible spectrum at its violet end and having a wavelength shorter than those of visible light but longer than those of X-rays
2
: relating to, producing, or using ultraviolet radiation
ultraviolet
noun
Medical Definition
ultraviolet
1 of 2 adjective
ul·tra·vi·o·let
ˌəl-trə-ˈvī-(ə-)lət
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
2 of 2 noun
: ultraviolet radiation
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