Acid Rain Definition

noun
Acid precipitation falling as rain.
American Heritage
Rain or other precipitation with a high concentration of acids produced by sulfur dioxide, nitrogen dioxide, and other such gases that result from the combustion of fossil fuels: it has a destructive effect on plant and aquatic life, buildings, etc.
Webster's New World

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.

Wiktionary
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Other Word Forms of Acid Rain

Noun

Singular:
acid rain
Plural:
acid-rains

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acid rain