priest: [OE] Priest goes back ultimately to the Greek noun presbúteros, which meant literally ‘elder’ (it was formed from the comparative of the adjective présbus ‘old’). It was used in the Greek translation of the New Testament for ‘elder of the church, priest’. It was borrowed into Latin as presbyter (source of English presbyterian [17]). This subsequently became reduced to *prēster (as in Prester John), which was taken over by Old English as prēost, ancestor of modern English priest. => presbyterian[priest etymology, priest origin, 英语词源]