non-existent substance · at some time hypothetised substance with particular properties, that later turned out not to exist · YYNN

non-existent substance

? TBD

at some time hypothetised substance with particular properties, that later turned out not to exist

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supposed fire-like element contained within combustible bodies and released during combustion, according to superseded scientific theories of the 17th and 18th centuries

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non-existent entity

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