\Ti*a"ra\, n. [L., from Gr. ?, ?; 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.

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.