perambulation (n.)youdaoicibaDictYouDict[perambulation 词源字典]
mid-15c., from Anglo-Latin (c. 1300) and Anglo-French perambulacion, from Medieval Latin perambulationem (nominative perambulatio), noun of action from past participle stem of Latin perambulare (see perambulate).[perambulation etymology, perambulation origin, 英语词源]