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

Scientists used to think only UVB was harmful because UVB rays cause sunburns. — Guy German, Fortune, 21 June 2026

Choose one that offers broad-spectrum protection from both UVB and UVA rays — both can cause skin cancer and visible signs of aging. — Kelle Walsh, NPR, 18 June 2026

About 95% of it is UVA (315-400 nm) and 5% is UVB (280-315 nm). — Guy German, The Conversation, 18 June 2026

The pendant pairs with The90 app, which processes live UVA and UVB data throughout the day. — New Atlas, 16 June 2026

New kid in the block Sunscreens are supposed to protect against both ultraviolet A (UVA) and B rays (UVB). — Devika Rao, TheWeek, 15 June 2026

According to the Warby Parker product page, Acuvue Oasys MAX 1-Day contacts also include a moisture technology called TearStable and block 82% of UVA rays and 97% of UVB rays. — Samantha Agate, Sacbee.com, 13 June 2026

Bemotrizinol is described as absorbing UVA and UVB light rays by the American Chemical Society. — Gina Kalsi, PEOPLE, 10 June 2026

Bemotrizinol is a chemical filter that protects against both UVA and UVB rays. — Emily Kay Votruba, EverydayHealth.com, 10 June 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