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from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Acid precipitation falling as rain.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Rain which is unusually acidic (pH of less than the natural range of 5 to 6); caused mainly by atmospheric pollution with sulphur dioxide and nitrogen compounds.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. rain containing acids that form in the atmosphere when industrial gas emissions (especially sulfur dioxide and nitrogen oxides) combine with water


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  • The name of a hot pepper sauce.

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