mortarboard

/mawr-ter-bawrd, -bohrd/US // ˈmɔr tərˌbɔrd, -ˌboʊrd //UK // (ˈmɔːtəˌbɔːd) //

臼齿板,迫击炮,迫击炮台,迫击炮板

Definitions

n.名词 noun

1
- : a board, usually square, used by masons to hold mortar.
- : Also called cap. a cap with a close-fitting crown surmounted by a stiff, flat, square piece from which a tassel hangs, worn as part of academic costume.

The ceremony at Georgetown University on Wednesday opened with the familiar strains of “Pomp and Circumstance” as graduates, wearing robes and mortarboards with tassels, filed into the auditorium.
Backstage earlier, McCaskill had given me tips on how to bobby pin the mortarboard cap to my head.
Mr. Worthington pushed back his mortarboard and revealed the crimson chevron which it had bitten into his bald brow.
A right instinct sent him tiptoe over his lawn, another made him doff his mortarboard.
As for the mortarboard and gown, undergraduate opinion rather requires that they be left behind.