noun
tricorne; three-cornered hat
Refers to the historical hat with a brim turned up on three sides, worn in the 17th–18th centuries.
18世紀のヨーロッパでは、紳士が三角帽をかぶっていた。
In 18th-century Europe, gentlemen wore tricornes.
Compound of 三角 (さんかく, 'triangle') and 帽 (ぼう, 'hat').