American Heritage® Dictionary of the English Language, Fourth Edition
- n. Acid precipitation falling as rain.
- 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.
- 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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These user-created lists contain the word ‘acid rain’.
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