Tiara

n. [ L., from Gr. &unr_;, &unr_;; of Persian origin. ] 1. A form of headdress worn by the ancient Persians. According to Xenophon, the royal tiara was encircled with a diadem, and was high and erect, while those of the people were flexible, or had rims turned over. [ 1913 Webster ]

2. The pope's triple crown. It was at first a round, high cap, but was afterward encompassed with a crown, subsequently with a second, and finally with a third. Fig.: The papal dignity. [ 1913 Webster ]