Dictionary

sunblock

noun sun·block \-ˌbläk\

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

Full 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

First Known Use of SUNBLOCK

1972

sunblock

noun sun·block \ˈsən-ˌbläk\   (Medical Dictionary)

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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