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dampproof

[damp-proof]
adjective
  1. resistant to dampness or the effects of dampness.
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verb (used with object)
  1. to make dampproof.
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Origin of dampproof

First recorded in 1880–85; damp + -proof
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018