chemical warfare
US /ˈkem.ɪ.kəl ˈwɔːr.fer/
UK /ˈkem.ɪ.kəl ˈwɔːr.fer/

1.
warfare using chemical agents to kill or injure or incapacitate enemy personnel
:
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The international community condemns the use of chemical warfare.
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Treaties have been signed to ban chemical warfare.