[mass noun] A highly poisonous gas or volatile liquid with an odour of bitter almonds, made by the action of acids on cyanides.
- ‘Tobacco contains over 4000 dangerous chemicals in the form of particles and gasses, particularly tar, nicotine, benzene, carbon monoxide, hydrogen cyanide and formaldehyde.’
- ‘Arsenic, formaldehyde, hydrogen cyanide, polonium and ammonia are among some of the 4,200 chemicals in a cigarette.’
- ‘In a fire, carbon monoxide, hydrogen cyanide, ammonia and hundreds of other chemicals can poison you and attack your eyes, nose, throat and lungs.’
- ‘Added to this would have been chemical consequences, the generation of poisonous hydrogen cyanide and nitrous oxide in the atmosphere.’
- ‘The compound commonly called cyanide is actually hydrogen cyanide, HCN.’