"You canker blossom!" 3 Shakespearean Insults
c.1400, from Old French monastere "monastery" (14c.) and directly from Late Latin monasterium, from Ecclesiastical Greek monasterion "a monastery," from monazein "to live alone," from monos "alone" (see mono-). With suffix -terion "place for (doing something)." Originally applied to houses of any religious order, male or female.