Meaning of “mortarboard” in the English Dictionary

american-english dictionary

(Definition of “mortarboard” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"mortarboard" in American English

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mortarboardnoun [ C ]

us /ˈmɔr·t̬ərˌbɔrd, -ˌboʊrd/

a black hat with a square, flat top, worn by some students and teachers on formal school occasions:

Following the ceremony, the graduating seniors all threw their mortarboards into the air.

(Definition of “mortarboard” from the Cambridge Academic Content Dictionary © Cambridge University Press)