Noun
Same as Berretta.
Source: Webster's dictionaryThe biretta of a cardinal is distinctive not merely for its scarlet color, but also for the fact that it does not have a pompon or tassel on the top as do the birettas of other prelates. Source: Internet
The mortarboard hat worn by graduates is adapted from a square cap called a biretta worn by Medieval professors and clerics File:Supreme Court US 2009. Source: Internet
This custom was discontinued in 1969 and the investiture now takes place with the scarlet biretta. Source: Internet