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Definition of mortar board noun from the Oxford Advanced Learner's Dictionary

mortar board

noun
 
/ˈmɔːtə bɔːd/
 
/ˈmɔːrtər bɔːrd/
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  1. a black hat with a stiff square top, worn by some university teachers and students at special ceremonies compare capTopics Clothes and Fashionc2, Educationc2
efficacy
noun
 
 
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