Relating to or containing sal ammoniac (ammonium chloride), a chemical salt historically used in metalworking and alchemy.
From 'armonia' or variant of 'ammoniac,' potentially influenced by the town of Ammonium or the Greek god Ammon. Medieval alchemists used this term for ammonium chloride, a valuable chemical compound.
Armoniac salt was so valuable in medieval chemistry that alchemists kept detailed notes on obtaining it—it was essential for metalworking, and its properties seemed almost magical to people who didn't understand chemistry.
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