A historical or archaic term for a nitrogen compound or nitrogenous substance; sometimes used to refer to nitrogen itself in older chemical texts.
From azote (French for nitrogen) + -in (a chemical suffix indicating a substance or compound). This term appears in 18th-19th century chemistry literature when the French terminology for nitrogen was being adopted across Europe.
Azotin is essentially a fossil word—it's a reminder that chemistry used to use French names for elements, and we can see this in the 'azo-' prefix that still shows up in modern chemistry for nitrogen-containing compounds.
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