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Pronunciation: si'an-id


  1. The radical –CN or ion (CN)-. The ion is extremely poisonous, forming hydrocyanic acid in water; has the odor of almond oil; inhibits proper metabolism of oxygen through disruption of respiratory proteins (cytochromes) at the cellular level.
  2. A salt of HCN or a cyano-containing molecule.
  3. Often used as a shortened term to describe cyanide gas.
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