hydrogen cyanide

/HH AY1 D R AH0 JH AH0 N S AY1 AH0 N AY0 D/
noun
  1. 1

    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.

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Source: https://en.wiktionary.org/wiki/hydrogen%20cyanide