sun·​block | \ ˈsən-ˌbläk How to pronounce sunblock (audio) \

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 Babies are also often deficient in vitamin D because they shouldn't be exposed to the sun too much without sunblock. Lauren Corona,, "The best postnatal vitamin of 2020," 17 Oct. 2020 Some dogs can be sensitive to the sun, so be sure to bring dog-friendly sunblock if necessary. Star Tribune, "Staycation with your dog," 7 Aug. 2020 Sunscreen and sunblock also have different application methods. Claire Gillespie,, "Sunscreen vs. Sunblock: What's the Difference, and Which One Is Better?," 2 July 2020 Makeshift booths offered hot food, radical literature, and sunblock, all for free. Spencer Kornhaber, The Atlantic, "Pride Can’t Go Back to What It Was Before," 30 June 2020 Experts say a combination of factors – fewer people in the water, less pollution from boats and sunblock, and fewer bright lights along the seashore – may account for the sea glow. Mark Stevenson, USA TODAY, "Pristine Cancun greets excited tourists as the rest of Mexico desperately waits to reopen," 11 June 2020 The aisles are crammed with revelers in neon Wayfarers and the occasional alien antenna headband, loading up on sunblock and Oreos. Jordan Runtagh,, "The Storming of Area 51: A Covert Journey to the Heart of America’s Worst-Kept Secret," 13 Jan. 2020 Wear the Moon River Tropical Faux Wrap Ruffle Hem Skirt and Tropical Tie Back Top for a day exploring Collins Avenue, and use the Loeffler Randall Marlena Pieced Tote Bag to store your sunblock and a book while hitting the beach. Madison Roberts, Condé Nast Traveler, "Rent the Runway's Hotel Delivery Option Will Help You Pack Less," 9 Mar. 2020 But sunblock and quitting tanning salons aren’t happening; neither are prescription glasses. Adam Popescu, New York Times, "Dog the Bounty Hunter Is Hunting Alone," 17 Jan. 2020

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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Time Traveler for sunblock

Time Traveler

The first known use of sunblock was in 1953

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Statistics for sunblock

Last Updated

31 Oct 2020

Cite this Entry

“Sunblock.” Dictionary, Merriam-Webster, Accessed 29 Nov. 2020.

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More Definitions for sunblock


How to pronounce sunblock (audio)

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 How to pronounce sunblock (audio) \

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 How to pronounce sunblock (audio) \

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

More from Merriam-Webster on sunblock

Nglish: Translation of sunblock for Spanish Speakers Encyclopedia article about sunblock

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