from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun Acid precipitation falling as rain.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun Rain which is unusually
acidic( pHof less than the natural range of 5 to 6); caused mainly by atmospheric pollutionwith sulphur dioxideand nitrogen compounds.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun 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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