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Definition of Black rain
1. Noun. rain contaminated by fungi spores, soot, or other particulate matter(reference-book title = The New International Encyclopædia year = 1902 publisher = Dodd, Mead and Company language = English pages = 81) ¹
2. Noun. radioactive rain that fell on Hiroshima and Nagasaki following the atomic bombings of 1945(reference-book last = ?e first = Kenzabur? title = Hiroshima Notes year = 1996 publisher = Grove Press language = English, translated from Japanese id = 0802134645 pages = 192) ¹
¹ Source: wiktionary.com