birretta birr • birse · · · Info · Definitions · Synonyms · Characters · · birretta · · Text Latin · · Script 8 · · Length 3 · · Syllables Definitions · · · (noun) a stiff cap with ridges across the crown; worn by Roman Catholic clergy. Synonyms: biretta, berretta. · · Noun Definition 1 Synonyms · · · biretta · · Synonym 1 berretta · · Synonym 2 Characters · · a latin small letter a U+0061 b latin small letter b U+0062 e latin small letter e U+0065 i latin small letter i U+0069 r latin small letter r U+0072 t latin small letter t U+0074