tiara

An ornamental, often jeweled, crownlike semicircle worn on the head by women on formal occasions.

The triple crown historically worn by the pope, especially at his coronation ceremony, and still used heraldically as a symbol of the papacy.

An ornament or article of dress with which the ancient Persians covered the head: a kind of turban.

A cylindrical diadem pointed at the top, tipped with the mound and cross of sovereignty, and surrounded with three crowns, which the Pope wears as a symbol of his threefold sovereignty.

Figuratively, the papal dignity.

A coronet or frontal; an ornament for the head: used loosely for any such ornament considered unusually rich: as, a tiara of brilliants.

In heraldry, a bearing representing a tall cap-like or pointed dome surrounded by three crowns, one above the other, and having at the point an orb and cross: it is supposed to represent the crown of the Pope.

In conchology: A miter-shell.

[capitalized] A genus of miter-shells.

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.