sunblock

noun

sun·​block ˈsən-ˌbläk 

: a preparation (such as a lotion) applied to the skin to prevent sunburn (as by physically blocking out ultraviolet radiation)

also : its active ingredient (such as titanium dioxide) compare sunscreen

Examples of sunblock in a Sentence

Recent Examples on the Web

Keep sunblock next to your kid's toothpaste. —Barrie Gillies, Parents, 9 Mar. 2026

Look at him carrying his baby to the park, to the market, to the playground; tying a bonnet to her head; slathering her plump pink arms with organic sunblock. —Daniel Smith, The Atlantic, 27 Feb. 2026

In addition to her skincare and makeup routine, Martha also credits her healthy hair and skin to exercising, eating well, wearing sunblock, and drinking her green juice everyday. —Michele Laufik, Martha Stewart, 21 Jan. 2026

The public is asked to bring a mat and sunblock and RSVP ahead of each class due to limited space. —Abby Hamblin, San Diego Union-Tribune, 30 Dec. 2025

Word History

First Known Use

1953, in the meaning defined above

Rhymes for sunblock

• alcock
• beanstalk
• bedrock
• boardwalk
• catwalk
• cornstalk
• crosswalk
• deadlock
• feedstock
• fetlock
• flintlock
• goshawk

Kids Definition

sunblock

noun

sun·​block -ˌbläk 

: a preparation (as a lotion) applied to the skin to prevent sunburn (as by physically blocking out the sun's rays)

Medical Definition

sunblock

noun

sun·​block ˈsən-ˌbläk 

: a preparation (as a lotion) applied to the skin to prevent sunburn (as by physically blocking out ultraviolet radiation)

also : its active ingredient (as titanium dioxide) compare sunscreen