from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Precipitation abnormally high in sulfuric and nitric acid content that is caused by atmospheric pollutants.
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
Sorry, no etymologies found.