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rainwater

[reyn-waw-ter, -wot-er] /ˈreɪnˌwɔ tər, -ˌwɒt ər/
noun
1.
water fallen as rain.
Origin
1000
before 1000; Middle English rein water, Old English regn-wæter; see rain, water

Rainwater

[reyn-waw-ter, -wot-er] /ˈreɪnˌwɔ tər, -ˌwɒt ər/
noun
1.
(Leo) James, 1917–86, U.S. physicist: Nobel prize 1975.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for rainwater

rainwater

/ˈreɪnˌwɔːtə/
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
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Word Origin and History for rainwater
n.

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

Online Etymology Dictionary, © 2010 Douglas Harper
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12
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