Jisho

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Noun
1. miasma; noxious form of "bad air" formerly believed to cause diseases
Wikipedia definition
2. Miasma theoryThe miasma theory (also called the miasmatic theory) held that diseases such as cholera, chlamydia or the Black Death were caused by a miasma, a noxious form of "bad air". The miasma theory was accepted from ancient times in Europe, India and China. The theory was eventually displaced in the 19th century by the discovery of germs and the germ theory of disease.
Read “Miasma theory” on English Wikipedia
Read “瘴気” on Japanese Wikipedia
Read “Miasma theory” on DBpedia

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