UVB

noun

ˌyü-(ˌ)vē-ˈbē 

: radiation that is in the region of the ultraviolet spectrum which extends from about 280 to 320 nm in wavelength and that is primarily responsible for sunburn, aging of the skin, and the development of skin cancer

Examples of UVB in a Sentence

Recent Examples on the Web

The ingredient, which has been used in Europe and other countries for years, provides broad-spectrum protection against both UVA and UVB rays. — Kaitlyn Harvey, AJC.com, 17 July 2026

The style is hard-working in the heat, featuring the brand’s Omni-Shade UPF 50 to protect against harsh UVA and UVB rays that cause wrinkles and sunburn, respectively. — Tanya Sharma, PEOPLE, 17 July 2026

The former protects you from 97% of UVB rays, and the latter protects you from 98%. — Bestreviews, Mercury News, 13 July 2026

Sunglasses for your little one can protect their eyes and reduce glare—just make sure that the label states that the lenses block at least 99% of ultraviolet (UVA and UVB) radiation. — Nancy Mattia, Parents, 8 July 2026

Word History

First Known Use

1975, in the meaning defined above

Medical Definition

UVB

noun

-ˈbē 

: radiation that is in the region of the ultraviolet spectrum which extends from about 280 to 320 nm in wavelength and that is primarily responsible for sunburn, aging of the skin, and the development of skin cancer