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  • rainwater
    rainwater
    noun
    water fallen as rain.
  • Rainwater
    Rainwater
    noun
    (Leo) James, 1917–86, U.S. physicist: Nobel Prize 1975.
Synonyms

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; see 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.

See Examples For:

At the same time, groundwater and rainwater that seep underground must be collected and pumped back to the surface.

From Science Daily Jul. 6, 2026

Liou and her gardener helped Lee install it and build a bioswale to catch rainwater, using stones from Valley Builders Supply and some larger rocks from Bourget Bros.

From Los Angeles Times Jun. 10, 2026

Here by the water’s edge, she nibbles on seeds and drinks rainwater, retreating to the house to sleep at night.

From The Wall Street Journal May 22, 2026

Oil fires can also release sulphur and nitrogen oxides, which can form acids if they dissolve in rainwater, as well as other harmful hydrocarbons, metallic compounds and droplets of oil.

From BBC Mar. 10, 2026

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

Rainwater is harvested from the greenhouse roofs and in response to changing weather patterns, the company are now beginning to recycle that water, and the nutrients it contains, for secondary use.

From BBC May 14, 2026

The study was funded by the Rainwater Charitable Foundation/Tau Consortium, the National Institutes of Health and other sources.

From Science Daily Mar. 3, 2026

Alumni from “Yellowstone” returning in “Marshals” include Gil Birmingham as tribal Chairman Thomas Rainwater and Mo Brings Plenty as his confidante Mo.

From Los Angeles Times Mar. 1, 2026

Joseph Shaposhnik, portfolio manager of the Rainwater Equity ETF, substantially reduced his exposure to software names over the summer, including selling most of his position in Constellation Software Inc.

From MarketWatch Feb. 4, 2026

Rainwater dripping from the roof splattered in the mud below.

From "The Boys in the Boat: Nine Americans and Their Epic Quest for Gold at the 1936 Berlin Olympics" by Daniel James Brown

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