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
Scientists now believe that UVA—ultraviolet light with wavelengths between 315 and 400 nanometers—can raise the risk of skin cancer, too.
—
Jackie Flynn Mogensen, Scientific American, 25 May 2026
Moreover, many insects have been observed fluttering around ultraviolet lamps and other light sources that emit low quantities of heat, as well as seeking out light sources when the ambient temperature is high, contradicting the premise of the thermal radiation theory.
—Britannica Editors, Encyclopedia Britannica, 22 May 2026
Post-operative care is provided with a special kit containing shampoos, lotions, and medical products, and the clinic maintains high hygiene standards by sanitizing procedure rooms through ultraviolet technology.
—Wyles Daniel, USA Today, 20 May 2026
Crews must deal with icing, corrosion, ultraviolet exposure, thermal cycling, and extreme winds.
—Aamir Khollam, Interesting Engineering, 20 May 2026
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Jackie Flynn Mogensen, Scientific American, 25 May 2026
Moreover, many insects have been observed fluttering around ultraviolet lamps and other light sources that emit low quantities of heat, as well as seeking out light sources when the ambient temperature is high, contradicting the premise of the thermal radiation theory.
—Britannica Editors, Encyclopedia Britannica, 22 May 2026
Post-operative care is provided with a special kit containing shampoos, lotions, and medical products, and the clinic maintains high hygiene standards by sanitizing procedure rooms through ultraviolet technology.
—Wyles Daniel, USA Today, 20 May 2026
Crews must deal with icing, corrosion, ultraviolet exposure, thermal cycling, and extreme winds.
—Aamir Khollam, Interesting Engineering, 20 May 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 29 May. 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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