Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

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acid rain rain that contains acid from pollution.
rain cats and dogs to rain very hard.
rain check a postponement of an accepted invitation or offer, esp. an assurance to a customer that a sale item that is sold out can be purchased later at the reduced price. [2 definitions]
rain gauge an instrument that collects and measures the amount of rainfall in a specific time and place.
rain shadow the lee side of a mountainous barrier, which receives little or no precipitation.
rainforest a dense evergreen forest, mostly found in tropical areas, that receives a large amount of rain all year long.
yellow rain a highly toxic yellowish powder found in Southeast Asia between 1975 and 1985, thought by some to be a chemical warfare agent dropped by airplanes.