bishop (Orthodox, Anglican, etc.)
Used for bishops in Christian denominations other than the Roman Catholic Church, for which 司教 is typically used.
See also: 司教
After many years of service, he became a bishop.
He was appointed bishop of the Church of England.
主教 refers to a bishop in Orthodox, Anglican, or other non-Catholic churches, while 司教 specifically denotes a Roman Catholic bishop.
From 主 (lord, master) + 教 (teaching, religion), likely a coined term for Christian bishops outside the Catholic context.