Relating to or containing ferricyanide combined with hydrogen, or referring to ferricyanic acid and its properties.
Compound adjective combining 'ferricyan-' (ferric cyanide) with '-hydric' (from hydrogen), used in older chemical nomenclature to describe hydrogen-containing ferricyanide compounds.
This word is a fossil from 19th-century chemistry—older naming systems tried to pack all structural information into adjectives, which is why you see such wonderfully baroque terms like 'ferricyanhydric' that modern chemists would simply call 'ferricyanic acid'.
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