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
The researchers focused an ultraviolet laser beam onto one specific point on the nanotube.
—
Rupendra Brahambhatt, Interesting Engineering, 27 Dec. 2025
Computer simulations showed that any methane on TRAPPIST-1e would be rapidly destroyed by intense ultraviolet radiation, surviving only about 200,000 years — not nearly long enough for geological processes to replenish it.
—Sharmila Kuthunur, Space.com, 26 Dec. 2025
The ozone layer functions as a global shield against harmful levels of ultraviolet solar radiation.
—Solcyré Burga, Time, 26 Dec. 2025
Designed to be entirely clear, the domes would let in sunlight but not harmful ultraviolet rays from the sun, says Robin Wordsworth, an earth and planetary sciences professor at Harvard University and a co-author of the new research.
—Claire Cameron, Scientific American, 18 Dec. 2025
See All Example Sentences for ultraviolet
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Rupendra Brahambhatt, Interesting Engineering, 27 Dec. 2025
Computer simulations showed that any methane on TRAPPIST-1e would be rapidly destroyed by intense ultraviolet radiation, surviving only about 200,000 years — not nearly long enough for geological processes to replenish it.
—Sharmila Kuthunur, Space.com, 26 Dec. 2025
The ozone layer functions as a global shield against harmful levels of ultraviolet solar radiation.
—Solcyré Burga, Time, 26 Dec. 2025
Designed to be entirely clear, the domes would let in sunlight but not harmful ultraviolet rays from the sun, says Robin Wordsworth, an earth and planetary sciences professor at Harvard University and a co-author of the new research.
—Claire Cameron, Scientific American, 18 Dec. 2025
See All Example Sentences for ultraviolet
Cite this Entry
“Ultraviolet.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/ultraviolet. Accessed 31 Dec. 2025.
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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