noun
blister gas; vesicant
Technical term for chemical warfare agents that cause severe skin blistering, such as mustard gas.
びらん性ガスは皮膚に激しい水疱を生じさせる。
Blister gas causes severe blisters on the skin.
毒ガス is a broader term for any poisonous gas, while びらん性ガス specifically refers to blister agents.
Compound of びらん (糜爛, 'erosion, ulceration') + 性 (-sei, 'nature, property') + ガス (gasu, 'gas'). The term is a direct calque from English 'blister gas' or German 'Blasengas'.