from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Ecclesiastical A stiff square cap with three or four ridges across the crown. Birettas are worn especially by Roman Catholic clergy and are black for priests, purple for bishops, and red for cardinals.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A square cap, originally with four ridges across the top, surmounted by a tuft, worn by Roman Catholic clergy (and by some in the Anglican Church). A three-sided biretta is worn by Roman Catholic clergy for liturgical celebrations.
from the GNU version of the Collaborative International Dictionary of English
- n. Same as berretta.
from The Century Dictionary and Cyclopedia
- n. Originally, any small cap worn as distinctive of a trade or profession; afterward, a scholastic cap, or such as was worn indoors by members of the learned professions; now, in the Roman Catholic Church, the ecclesiastical cap.
- n. BY extension, a Tunis cap; a smoking-cap.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a stiff cap with ridges across the crown; worn by Roman Catholic clergy
Italian berretta, from Old Provençal berret, cap, from Late Latin birrus, hooded cloak, probably of Celtic origin.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Italian 'biretta' (Wiktionary)