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rainwater

noun [U]
 
 
/ˈreɪnˌwɔː.tər/ US  /-ˌwɑː.t̬ɚ/

Definition

water that has fallen as rain, rather than water that has come from a tap: I collect rainwater to water my plants.Water in generalRain
(Definition of rainwater noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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