What It Was Believed to Be

Azoth functioned, in the broader philosophical sense used across much of the alchemical literature, as the name for a universal mercurial spirit or principle, an active, penetrating essence believed to pervade all matter and to be the necessary catalyst or medium through which the transformations of the Great Work could proceed. This usage treated azoth less as a specific ingredient to be measured out from a jar than as a philosophical and quasi-spiritual concept, closely related to but broader than the alchemical principle Mercury of the tria prima, and writers invoking it were often making a claim about the underlying unity of matter rather than describing a recipe with reproducible physical steps.

Paracelsus, separately, used the term azoth for a specific medicinal preparation of his own devising, apparently a mercury based remedy he promoted for its supposed broad curative powers, a narrower and more concrete usage documented in the Paracelsian medical corpus. Historians of Paracelsus including Charles Webster note that Paracelsus's own writing style, deliberately obscure and idiosyncratic even by the standards of his period, makes it genuinely difficult to establish with confidence exactly what azoth referred to in every passage where he used the word, and later commentators and popularizers have not always distinguished his specific medicinal usage from the broader philosophical concept found in other alchemical writers.