Etymology
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rainwater (n.)

"water that has fallen from the clouds as rain and has not sunk into the earth," Old English renwæter; see rain (n.) + water (n.1).

updated on April 05, 2021

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Definitions of rainwater from WordNet

rainwater (n.)
drops of fresh water that fall as precipitation from clouds;
Synonyms: rain
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.