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

Many modern formulas combine both for broad-spectrum protection. —Heather Jones, Verywell Health, 26 Sep. 2025

This lightweight, silky formula pairs broad-spectrum sun protection with antioxidant-rich white tea to help fend off free radicals and environmental stressors that can accelerate visible aging. —Christa Joanna Lee, Allure, 12 Sep. 2025

To ensure pollination, plant trees in guilds and avoid broad-spectrum synthetic pesticides. —Lauren Landers, Better Homes & Gardens, 2 Sep. 2025

While formulations vary, the general rule is to select a broad-spectrum shield with a sun protection factor (SPF) of 30. —Khanh T.l. Tran, USA Today, 29 Aug. 2025

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