What is the X in X-mas?
1610s, "a French priest," from French père "father," from Latin patrem (nominative pater); see father (n.). Attached to a name, to distinguish father from son of the same name, from 1802.
divided, one of the mysterious words "written over against the candlestick upon the plaster of the wall" of king Belshazzar's palace (Dan. 5:28). (See MENE.)