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mortarboard

noun [C]
 
 
/ˈmɔː.tə.bɔːd/ US  /ˈmɔːr.t̬ɚ.bɔːrd/

Definition

a black hat with a square, flat top, worn on formal occasions by some teachers and students at college or university, and in the past by some schoolteachersThings worn to cover the head, face or neck
(Definition of mortarboard noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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