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Definition of Poison gas
1. Noun. A gas that is poisonous to breath or contact; used in chemical warfare.
Generic synonyms: Chemical Weapon, Gas
Specialized synonyms: Blistering Agent, Dichloroethyl Sulfide, Mustard Agent, Mustard Gas, Sulfur Mustard, Nerve Agent, Nerve Gas
Specialized synonyms: Blistering Agent, Dichloroethyl Sulfide, Mustard Agent, Mustard Gas, Sulfur Mustard, Nerve Agent, Nerve Gas