dampproof

[ damp-proof ]
/ ˈdæmpˌpruf /

adjective

resistant to dampness or the effects of dampness.

verb (used with object)

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. 2020

British Dictionary definitions for dampproof

damp-proof
/ building trades /

verb

to protect against the incursion of damp by adding a dampcourse or by coating with a moisture-resistant preparation

adjective

protected against damp or causing protection against dampa damp-proof course
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012