Dictionary

poison gas

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

First Known Use of POISON GAS

1915

poison gas

noun    (Medical Dictionary)

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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