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sunblock

or sun block

[suhn-blok]
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noun
  1. a substance that provides a high degree of protection against sunburn, often preventing most tanning as well as burning, as by obstructing the penetration of ultraviolet rays.
  2. a lotion, cream, etc., containing such a substance.

Origin of sunblock

First recorded in 1975–80; sun + block
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
sun block in Medicine

sun block

(sŭn)
n.
  1. A preparation, as of PABA, that prevents sunburn by filtering out the sun's ultraviolet rays, usually offering more protection than a sunscreen.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.