popeyoudaoicibaDictYouDict[pope 词源字典]
pope: [OE] Etymologically, the pope is the ‘daddy’ of the Roman Catholic church. Greek páppas was a nursery word for ‘father’, based no doubt on the first syllable of patér ‘father’ (a relative of English father). In the form pápas it came to be used by early Christians for ‘bishop’, and its Latin descendant pāpa was applied from the 5th century onwards to the bishop of Rome, the pope.

English acquired the word in the Anglo-Saxon period, and so it has undergone the normal medieval phonetic changes to become pope, but the derivatives papacy [14] and papal [14] arrived later, and retain their a. Latin pāpa also gave English papa [17], via French papa.
=> papa, papacy, poplin[pope etymology, pope origin, 英语词源]
pope (n.)youdaoicibaDictYouDict
Old English papa (9c.), from Church Latin papa "bishop, pope" (in classical Latin, "tutor"), from Greek papas "patriarch, bishop," originally "father." Applied to bishops of Asia Minor and taken as a title by the Bishop of Alexandria c.250. In Western Church, applied especially to the Bishop of Rome since the time of Leo the Great (440-461) and claimed exclusively by them from 1073 (usually in English with a capital P-). Popemobile, his car, is from 1979. Papal, papacy, later acquisitions in English, preserve the original vowel.