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English definition of “mortarboard”

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mortarboard

noun [C]  /ˈmɔr·t̬ərˌbɔrd, -ˌboʊrd/ us  
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.
Translations of “mortarboard”
in Chinese (Traditional) (黑色的)方頂帽,學位帽…
in Chinese (Simplified) (黑色的)方顶帽,学位帽…
(Definition of mortarboard from the Cambridge Academic Content Dictionary © Cambridge University Press)
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