Dictionary

poison gas

noun

: gas that can cause a person to die or to become very sick : poisonous gas

Full Definition of POISON GAS

:  a poisonous gas or a liquid or a solid giving off poisonous vapors designed (as in chemical warfare) to kill, injure, or disable by inhalation or contact
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First Known Use of POISON GAS

1915
Medical Dictionary

poison gas

noun

Medical Definition of POISON GAS

:  a poisonous gas or a liquid or a solid giving off poisonous vapors designed (as in chemical warfare) to kill, injure, or disable by inhalation or contact

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