acid-rain

acid rain

noun
precipitation, as rain, snow, or sleet, containing relatively high concentrations of acid-forming chemicals, as the pollutants from coal smoke, chemical manufacturing, and smelting, that have been released into the atmosphere and combined with water vapor: harmful to the environment.

Origin:
1855–60

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World English Dictionary
acid rain
 
n
rain that contains a high concentration of pollutants, chiefly sulphur dioxide and nitrogen oxide, released into the atmosphere by the burning of fossil fuels such as coal or oil

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Cultural Dictionary

acid rain definition


A type of precipitation made up of dilute acids, primarily a by-product of heavy industry.

Note: Acid rain is a result of the combination of water with chemicals released into the atmosphere by the burning of fossil fuels.
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
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