1. (noun) a toxic war gas with sulfide based compounds that raises blisters and attacks the eyes and lungs; there is no known antidote

• blistering agent
• dichloroethyl sulfide
• mustard agent
• mustard gas

1. (noun) a toxic war gas with sulfide based compounds that raises blisters and attacks the eyes and lungs; there is no known antidote

• poison gas
• vesicant
• vesicatory