broad-spectrum

adjective

broad-spec·​trum ˈbrȯd-ˈspek-trəm 

1

: effective against a wide range of organisms (such as insects or bacteria)

a broad-spectrum antibiotic

2

: effective in protecting skin from ultraviolet radiation by absorbing or blocking both UVA and UVB rays

broad-spectrum sunscreens

Examples of broad-spectrum in a Sentence

Recent Examples on the Web

Of course, the best ingredient is the broad-spectrum SPF 50, which protects against the sun’s harmful UVA/UVB rays. — Alyssa Morin, InStyle, 24 June 2026

For prolonged outdoor activities such as swimming, exercising or spending time at the beach, Reszko recommends opting for broad-spectrum SPF 50. — Kate Donnelly, Forbes.com, 23 June 2026

Equally important, broad-spectrum sun protection is one of the most effective ways to help prevent the fine lines and wrinkles associated with photoaging. — Jenny Berg, Glamour, 22 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

Word History

First Known Use

1950, in the meaning defined at sense 1

Rhymes for broad-spectrum

• electrum
• spectrum

Medical Definition

broad-spectrum

adjective

1

: effective against a wide range of organisms (as insects or bacteria)

broad-spectrum antibiotics

compare narrow-spectrum

2

: effective in protecting skin from ultraviolet radiation by absorbing or blocking both UVA and UVB rays

broad-spectrum suncreen