Wiktionary
mortarboards
n. (plural of mortarboard English)
Usage examples of "mortarboards".
In another of its efforts toward reestablishing a milieu of scholastic tranquillity after decades of chaos and war, Munchen University had recently introduced gowns and mortarboards for both staff and students to wear for major interviews and other important occasions.
Mind you, he doubted if they made mortarboards to fit heads like that.