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

The current first-choice treatment for sepsis focuses on using broad-spectrum antibiotics to attack the pathogen causing the condition. —Harriet Marsden, TheWeek, 20 Feb. 2026

Neutrogena Ultra Sheer Dry-touch SPF 70 Sunscreen 3-pack Sun protection is extremely important when hiking, and while sun hats and clothing provide cover, applying a broad-spectrum sunscreen is critical for skin safety. —Michael Cappetta, Travel + Leisure, 5 Feb. 2026

The lightweight, glow-boosting oil delivers broad-spectrum chemical SPF while nourishing skin with a thoughtful blend of oils. —Christa Joanna Lee, Allure, 5 Feb. 2026

Medical staff are conducting tests to determine the root cause of the infection, and Aaron is receiving broad-spectrum antibiotics. —Ana Gutierrez, Austin American Statesman, 27 Jan. 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