Definition from Wiktionary, the free dictionary
- (Roman Catholicism) A ring worn by popes, representing the first pope and Christian apostle Peter, who had been a fisherman. Also known as the Pescatorio or Ring of the Fisherman.
- Oxford English Dictionary, 2nd ed., 1989.
- "Ring of the Fisherman" in The Catholic Encyclopedia, Robert Appleton Company, New York, 1912.