nerve agent

/N ER1 V EY0 JH AH0 N T/
noun
  1. 1

    A toxic chemical compound and banned weapon of mass destruction which, when inhaled or ingested, impairs nervous system functions, typically causing extreme physical distress and death by asphyxiation.

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Source: https://en.wiktionary.org/wiki/nerve%20agent, https://en.wiktionary.org/wiki/nerve%20gas