A volatile, aromatic liquid obtained from the distillation of tar or coal; a component of coal tar.
From Greek 'eu-' (good/well) plus possibly 'pion' (fat/grease), or from German sources; a 19th-century chemistry term for this distilled product.
Eupion was what chemists called the smelly, flammable liquid you got from cooking coal—a perfect example of how chemistry terminology often describes what you *smell* before you understand what it *is*!
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