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= hydrogen cyanide n. at hydrogen, n. compounds 1b(b); (also figurative) poisonous, unpleasant.
in thiocyanic acid, N⋮C.SH = cyanic acid, N⋮C.OH, in which oxygen is replaced by sulphur; a liquid with a penetrating odour.
in hydroferrocyˈanic acid = hydrogen ferrocyanide, H4FeCy6.