Definitions from Wiktionary (HCN)

▸ noun:  (chemistry) Initialism of hydrogen cyanide. [(inorganic chemistry) A colourless, very poisonous, volatile liquid, HCN, used in the production of dyes, plastics and fumigants; it dissolves in water to form hydrocyanic acid and reacts with bases to form cyanides, and with some organic compounds to form nitriles.]
▸ noun:  (numbers) Initialism of highly composite number. [(number theory) A positive integer that has more divisors than any smaller positive integer.]



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