biretta bireme • Birgus · · · Info · Definitions · Synonyms · Characters · · biretta · · Text Latin · · Script 7 · · Length Definitions · · · (noun) a stiff cap with ridges across the crown; worn by Roman Catholic clergy. Synonyms: berretta, birretta. · · Noun Definition 1 Synonyms · · · berretta · · Synonym 1 birretta · · 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