sun·​block | \ˈsən-ˌbläk \

Definition of sunblock 

: 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

Sometimes that means stopping in the middle of a race to reapply sunblock to avoid unwanted side effects from exposure to sunlight. Derek Fitzgerald,, "Training for the Broad Street Run after a serious health event," 11 Apr. 2018 Like an anti-sunblock, chemicals in its juices disrupt your skin’s ability to filter out harmful UV rays. Megan Molteni, WIRED, "This Giant Invasive Flower Can Give You Third-Degree Burns," 3 July 2018 But with the deliberate inclusion of vitamin C in its blend, Supergoop boosts the antioxidant powers of this highly defensive sunblock. Adam Hurly, GQ, "The Best Vitamin C Products for Having Clear, Healthy Skin," 29 June 2018 So slather on the sunblock and consider keeping your window shade down. Chelsea Peng, Marie Claire, "5 Beauty Secrets of Flight Attendants," 8 June 2017 Highlights: Don your best fishing hat and remember the sunblock for 12 hours of fish fryin’ festivities. Elaine Rewolinski, Milwaukee Journal Sentinel, "Major summer festivals in Milwaukee in 2018; Summerfest and many more," 18 May 2018 When people are outside, sunblock, protective clothing and hats block the sun. Katie Parsons,, "Many people lack Vitamin D — even in the Sunshine State," 3 May 2018 If the bill passes, come July 2021, no sunblocks from Edgewell or other big pharma companies containing those chemicals will line the shelves of Hawaiian convenience stores, hotels, pharmacies, or supermarkets. Lisa Jhung, Outside Online, "Hawaii Moves to Ban Anti-Green Sunscreen," 1 May 2018 Wear hats and closed shoes; bring sunblock and gloves., "Fort Lauderdale, Oakland Park area events, April 18-28," 17 Apr. 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'sunblock.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of sunblock

1953, in the meaning defined above

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Dictionary Entries near sunblock





sun blotch



Statistics for sunblock

Last Updated

4 Oct 2018

Look-up Popularity

Time Traveler for sunblock

The first known use of sunblock was in 1953

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More Definitions for sunblock



English Language Learners Definition of sunblock

: a lotion that you put on your skin to prevent sunburn by completely blocking out the sun's rays


sun·​block | \ˈsən-ˌbläk \

Kids Definition of sunblock

: a preparation applied to the skin to prevent sunburn usually by blocking the sun's ultraviolet radiation


sun·​block | \ˈsən-ˌbläk \

Medical Definition of sunblock 

: 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

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