Wordnet 3.0
NOUN (1)
1.
a stiff cap with ridges across the crown;
worn by Roman Catholic clergy;
[syn: biretta, berretta, birretta]
WordNet (r) 3.0 (2006):
birretta
n 1: a stiff cap with ridges across the crown; worn by Roman
Catholic clergy [syn: biretta, berretta, birretta]