phlogiston
supposed fire-like element contained within combustible bodies and released during combustion, according to superseded scientific theories of the 17th and 18th centuries
en-GB/flɒd͡ʒɪstən/
en-US/fləˈd͡ʒɪstən/
supposed fire-like element contained within combustible bodies and released during combustion, according to superseded scientific theories of the 17th and 18th centuries