acid rain

== English == === Etymology === Coined in 1872 by Scottish chemist Robert Angus Smith. === Pronunciation === === Noun === acid rain (countable and uncountable, plural acid rains) Rain which is unusually acidic (pH of less than the natural range of 5 to 6); caused mainly by atmospheric pollution with sulphur dioxide, carbon dioxide and nitrogen compounds. Hypernym: acid precipitation ==== Translations ==== === Further reading === acid rain on Wikipedia.Wikipedia === Anagrams === Diracian, acridian, cnidaria