impervious to rain; keeping out or unaffected by rain: a rainproof cover; a rainproof coat.

verb (used with object)

to make rainproof.

Origin of rainproof

First recorded in 1825–35; rain + -proof
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Related Words for rainproof

impermeable, impervious, airtight, sealed

Examples from the Web for rainproof

Historical Examples of rainproof

British Dictionary definitions for rainproof



Also: raintight (of garments, materials, buildings, etc) impermeable to rainwater


(tr) to make rainproof
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

Word Origin and History for rainproof

also rain-proof, 1788, from rain (n.) + proof (n.).

Online Etymology Dictionary, © 2010 Douglas Harper