Relating to or containing cyanhydric acid, which is another name for hydrogen cyanide (HCN) dissolved in water.
From cyano- + hydric (relating to hydrogen). This term dates to early 19th-century chemistry when scientists were discovering and naming the various forms of cyanide compounds.
Cyanhydric acid is one of the most deadly chemicals known—just a few grams can kill a person—yet it's also naturally produced in tiny amounts by apple seeds and almonds, which shows how chemistry is all about context and dose.
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