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rainwater

1 American  
[reyn-waw-ter, -wot-er] / ˈreɪnˌwɔ tər, -ˌwɒt ər /

noun

  1. water fallen as rain.


Rainwater 2 American  
[reyn-waw-ter, -wot-er] / ˈreɪnˌwɔ tər, -ˌwɒt ər /

noun

  1. (Leo) James, 1917–86, U.S. physicist: Nobel Prize 1975.


rainwater British  
/ 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

Etymology

Origin of rainwater

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

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

He avoids bottled water due to microplastics and has set up an elaborate system to catch rainwater from the house roof.

From Slate • Mar. 30, 2026

These included data from Arctic ice-cores and rainwater samples collected around the world.

From Science Daily • Feb. 6, 2026

Touadera has pointed to his record on improving the security situation, paved roads, public lighting installed on major avenues and renovated rainwater drainage canals in the capital.

From Barron's • Dec. 28, 2025

Cisterns placed underneath parking lots, parks or open spaces in a neighborhood could store rainwater runoff for firefighting.

From Los Angeles Times • Dec. 17, 2025

A contributor to Dunlap's American Daily Advertiser who went by the initials “A. B.” could be seen poking around rainwater barrels in his neighborhood.

From "An American Plague: The True and Terrifying Story of the Yellow Fever Epidemic of 1793" by Jim Murphy