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 device was tested using ultraviolet light, and the team is now working to extend its capabilities to visible and infrared light for broader applications. —Neetika Walter, Interesting Engineering, 15 June 2026

According to Eyebuydirect, standard prescription lenses often include ultraviolet protection, but UV coatings do not stop blue-violet light from reaching the eyes. —Samantha Agate, Miami Herald, 13 June 2026

Leaving a bathing suit in the trunk of a hot car or hanging it in direct sunlight is also a no-no because high temperatures and ultraviolet rays can fade and break down the fibers. —Mary Marlowe Leverette, Southern Living, 12 June 2026

Bemotrizinol is a chemical compound that absorbs ultraviolet radiation, helping protect the skin from sun damage. —Danielle Zickl, Health, 12 June 2026

Word History

First Known Use

1840, in the meaning defined at sense 1

Phrases Containing ultraviolet

• far-ultraviolet
• near-ultraviolet

Rhymes for ultraviolet

• inviolate
• violet

Kids 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