nerve agent
US /ˈnɜːrv ˌeɪ.dʒənt/
UK /ˈnɜːrv ˌeɪ.dʒənt/
1.
a chemical substance that interferes with the nervous system and is used as a weapon
:
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The terrorists were suspected of developing a nerve agent.
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Exposure to a nerve agent can cause severe health problems or death.