Meaning & use
poison gas
A toxic gas capable of killing or seriously harming people who breathe it, often used as a weapon.
See it in a sentence
Soldiers in the trenches wore masks to protect themselves from poison gas attacks.
International treaties now ban the use of poison gas in warfare.
A note on using this word
Poison gas became infamous during World War I, prompting later international bans such as the Geneva Protocol.
Words with a similar meaning
toxic gas
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