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

Or, opt for the Joshua Tree dark sky UVB sun hoodie, which offers UPF protection and is tied to more than $140,000 in donations to the Joshua Tree National Park Association. — Jessica Chapel, Condé Nast Traveler, 4 Nov. 2026

Known for its ability to protect against UVA and UVB rays, the ingredient pairs a few other filters with the brand’s Cell-Ox Shield technology, which provides antioxidant protection against environmental stressors. — Kiana Murden, Vogue, 30 Oct. 2026

Look for ingredients like zinc oxide or titanium dioxide in your sunscreen, which keep both UVB and the more dangerous UVA rays at bay. — Norah O'Donnell, CBS News, 21 Oct. 2026

Previously, manufacturers had to mix multiple ingredients to protect against both UVA and UVB light. — ABC News, 14 Oct. 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