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 destruction of the ozone layer would allow hazardous ultraviolet radiation to rain down on the planet, adding to the series of climate cataclysms that would threaten civilization and most life on Earth. — Kevin Holden Platt, Forbes.com, 16 Aug. 2026

The cavity has been carved into the nebula by ultraviolet radiation and stellar winds from massive young stars. — Kaif Shaikh, Interesting Engineering, 15 Aug. 2026

Cloud features require ultraviolet filters, but the phases alone impress viewers — even binoculars show these phases clearly. — Damian Peach, Space.com, 13 Aug. 2026

Plastic screens become brittle under ultraviolet sunlight and crack in freezing temperatures. — Nick Perry, USA Today, 11 Aug. 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