cacodylic acid
noun
Word History
German Kakodyl, the radical (CH3)2As + -ic entry 1; Kakodyl from Greek kakṓdēs "foul-smelling" (from kakós "bad, ill, foul" + -ōdēs "having a given smell," adjective derivative from od-, the base of ózein "to smell, give off odor") + German -yl -yl — more at caco-, odor
Note: According to Jöns Jakob berzelius, he suggested the name Kakodyl to the chemist Robert bunsen, who was investigating it, because of "the extremely repellent smell of all of its compounds" ("… für welche ich Bunsen den Namen Kakodyl vorschlug, in Bezug auf den höchst wiedrigen Geruch aller seiner Verbindungen" - Jahresbericht über die Fortschritte der physischen Wissenschaften von Jacob Berzelius, 20. Jahrgang [1841], p. 527).
1840, in the meaning defined above
Medical Definition
cacodylic acid
noun