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rainwater

[reyn-waw-ter, -wot-er]
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noun
  1. water fallen as rain.

Origin of rainwater

before 1000; Middle English rein water, Old English regn-wæter; see rain, water

Rainwater

[reyn-waw-ter, -wot-er]
noun
  1. (Leo) James,1917–86, U.S. physicist: Nobel prize 1975.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for rainwater

rainwater

noun
  1. water from rain (as distinguished from spring water, tap water, etc)
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 rainwater

n.

Old English renwæter; see rain (n.) + water (n.1).

Online Etymology Dictionary, © 2010 Douglas Harper