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n. A square cap worn by ecclesiastics of the Roman Catholic Church. A cardinal's berretta is scarlet; that worn by other clerics is black, except that a bishop's is lined with green.

n. See biretta.

n. a stiff cap with ridges across the crown; worn by Roman Catholic clergy

"In his homily before he bestowed each new cardinal with the red hat of their office, known as a berretta, Benedict told them their role was "not to be served, but to serve" and urged them to shun "the logic of power.""

cap   

beretta    biretta