Cantonese (n.)youdaoicibaDictYouDict[Cantonese 词源字典]
1816, from Canton, former transliteration of the name of the Chinese region now known in English as Guangzhou. The older form of the name is from the old British-run, Hong Kong-based Chinese postal system. As an adjective from 1840.[Cantonese etymology, Cantonese origin, 英语词源]