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hydrogasification
hydrogel
hydrogen
hydrogen bomb
hydrogen bond
hydrogen bromide
hydrogen carbonate
hydrogen chloride
hydrogen cyanide
hydrogen embrittlement
hydrogen fluoride
hydrogen iodide
hydrogen ion
hydrogen peroxide
hydrogen sulfate
hydrogen sulfide
hydrogen sulfite
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hydrogen cyanide
hy·dro·gen cy·a·nide


noun 
Definition:
 
very poisonous gas: an extremely poisonous colorless liquid or gas with a characteristic smell of almonds. Source: reaction between an acid and a metal cyanide. HCN
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