Etymology
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biretta (n.)

square cap worn by Catholic clergy, 1590s, from Italian beretta, from Late Latin birrus, birrum "large cloak with hood;" which is perhaps of Gaulish origin, or from Greek pyrros "flame-colored, yellow."

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Definitions of biretta

biretta (n.)
a stiff cap with ridges across the crown; worn by Roman Catholic clergy;
Synonyms: berretta / birretta
From wordnet.princeton.edu