microcosmic salt
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English
[edit]Etymology
[edit]From its alchemical name sal microcosmicum.
Noun
[edit]
microcosmic salt (uncountable)
- (dated, chemistry) 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.