microcosmic salt

noun

microcosmic salt

noun

Etymology From its alchemical name sal microcosmicum.

Chemistry, Natural sciences, Physical sciences Dated A white salt, extracted from urine; once used in the preparation of phosphorus, and used in analytical tests for some metals; ammonium sodium hydrogenphosphate (NH₄)NaHPO₄.

Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.