chemical weapon
Refers to toxic chemicals and their delivery systems used as weapons; a formal, technical term.
化学兵器の使用は国際法で禁止されている。
The use of chemical weapons is prohibited under international law.
その国は化学兵器を廃棄する条約に署名した。
That country signed a treaty to destroy its chemical weapons.
The country was accused of using chemical weapons in the civil war.
The country had secretly possessed chemical weapons for many years.
The work of destroying the chemical weapons proceeded under international supervision.
The laboratory is suspected of having secretly developed chemical weapons.