1. A toxic war gas with sulphide based compounds that raises blisters and attacks the eyes and lungs; there is no known antidote
   "The use of sulphur mustard in warfare is prohibited by international law";
   - mustard gas, mustard agent, blistering agent, dichloroethyl sulfide, sulfur mustard [N. Amer]

Derived forms: sulphur mustards

Type of: poison gas, vesicant, vesicatory

Encyclopedia: Sulphur mustard