Hydrogen Cyanide

**Semantic type:** Hazardous or Poisonous Substance|Inorganic Chemical

**Definition:** A highly toxic conjugate acid of a cyanide that is used as a chemical weapon agent. It is characterized as a colorless gas or liquid with a strong pungent odor that causes irritation of the eyes and respiratory tract, as well as toxic systemic effects.

**Synonyms:** - HYDROGEN CYANIDE - HYDROGEN CYANIDE