: 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
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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 See All Example Sentences for sunblock