Etymology
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phlogiston (n.)

1730, hypothetical inflammatory principle, formerly believed to exist in all combustible matter, from Modern Latin (1702), from Greek phlogiston (1610s in this sense), neuter of phlogistos "burnt up, inflammable," from phlogizein "to set on fire, burn," from phlox (genitive phlogos) "flame, blaze" (from PIE root *bhel- (1) "to shine, flash, burn"). The theory was propounded by Stahl (1702), denied by Lavoisier (1775), defended by Priestley, but generally abandoned by 1800. Related: Phlogistic; phlogisticated.

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Definitions of phlogiston

phlogiston (n.)
a hypothetical substance once believed to be present in all combustible materials and to be released during burning;
From wordnet.princeton.edu