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Definition of "waterproof" []

  • Impervious to or unaffected by water. (adjective)
  • Made of or coated or treated with rubber, plastic, or a sealing agent to prevent penetration by water. (adjective)
  • A material or fabric that is impervious to water. (noun)
  • Chiefly British A raincoat or other such outer garment. (noun)
  • To make impervious to water. (verb-transitive)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Use "waterproof" in a sentence
  • "Water perification of some sort. knife matches in waterproof container. compass"
  • "Â This was also in waterproof ink, but using a finer point pen."
  • "The jacket no longer has a main waterproof zipper."