Cistercian (adj.)youdaoicibaDictYouDict[Cistercian 词源字典]
c. 1600, "pertaining to the Cistercian order of monks," with -an + Medieval Latin Cistercium (French Cîteaux), site of an abbey near Dijon, where the monastic order was founded 1098 by Robert of Molesme. As a noun, "monk of the Cistercian order," from 1610s.[Cistercian etymology, Cistercian origin, 英语词源]