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[reyn-proof] /ˈreɪnˌpruf/
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
1825-35; rain + -proof Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for rainproof
  • rainproof and insect proof inside, and providing good insulation from the heat and the cold.
  • The cabinet shall be rainproof with the top of the enclosure crowned to prevent standing water.
  • If exposed to rain, they must be listed as rainproof.
  • The disconnect switch must be mounted in the upright position and shall be rainproof if exposed to weather.
  • Install a rainproof bulletin board for announcing garden events and messages to keep members up to date and recruit new gardeners.
  • If the instrument is wet this position will allow the water to run away from the areas that are not rainproof.
  • rainproof caps shall be furnished for tubular posts.
  • Designed to be rainproof, they are ventilated using a thermostatically controlled fan.
  • The housing shall be rainproof with the top of the enclosure crowned to prevent standing water.
  • Unit shall have a factory-built and wired electrical control panel in rainproof enclosure.
British Dictionary definitions for rainproof


Also raintight. (of garments, materials, buildings, etc) impermeable to rainwater
(transitive) 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
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Word Origin and History for rainproof

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

Online Etymology Dictionary, © 2010 Douglas Harper
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