phlogiston
phlo·gis·ton
noun
1.
a hypothetical substance once believed to be present in all combustible materials and to be released during burning
Origin
From New Latin phlogiston, coined by Georg Ernst Stahl in 1702, from Ancient Greek φλογιστόν (phlogistón), neuter of φλογιστός (phlogistós, “burnt up, inflammable”), from φλογίζω (phlogízō, “to set fire to”), from φλόξ (phlóx, “flame”).
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Broader terms
WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.