Pronunciation: /fləˈdʒɪstən/
noun a substance once believed to exist in all combustible materials and to be released during combustion
A1 Phlogiston is a substance once believed to be responsible for combustion.
A2 Scientists in the past thought that phlogiston was released during burning.
B1 The theory of phlogiston was eventually replaced by the modern understanding of combustion.
B2 Historically, phlogiston was thought to be a type of element that could explain combustion.
C1 The concept of phlogiston has been thoroughly debunked by advances in chemistry.
C2 Chemists of the 18th century believed that phlogiston was a crucial component in understanding combustion reactions.
formal The theory of phlogiston, an outdated concept in chemistry, posited that all combustible objects contained a substance called phlogiston.
informal Back in the day, scientists actually believed in this thing called phlogiston that they thought was responsible for combustion.
slang Phlogiston was like the OG fire juice according to old-school chemists.
figurative Her passion for the project burned like the phlogiston fueling an ancient alchemical experiment.
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