vesicant (n.)youdaoicibaDictYouDict[vesicant 词源字典]
"a blistering agent," 1660s, from Medieval Latin vesicantem (nominative vesicans), present participle of vesicare, from vesica "a bladder, a blister" (see ventral). From 1826 as an adjective.[vesicant etymology, vesicant origin, 英语词源]