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

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acid rain rain that has high acidity because of being mixed with pollutants such as vehicle exhausts and residues from burning of fossil fuels for energy or from chemical manufacturing.
rain cats and dogs to rain very heavily.
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 forest of evergreens and heavy undergrowth in a tropical area that receives abundant rainfall throughout the year.
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.