sulfur mustard

mus·tard gas (HD),

a poisonous vesicating gas introduced in World War I; it is the progenitor of the so-called nitrogen mustards; used in chemical warfare; a known carcinogen.

Synonym(s): di, mustard (2) , sulfur mustard

sul·fur mustard

(sŭl'fŭr mŭs'tărd)

A vesicating chemical-warfare agent used extensively in World War I (1914-1918) and thereafter and sometimes called "mustard gas," a misnomer because it does not boil until 217°C (423°F). The NATO code for the impure sulfur mustard prepared by the Löwenstein process used in World War I is H; the NATO code for neat, or distilled, sulfur mustard is HD.