mortarboard
noun[C]
uk/ˈmɔː.tə.bɔːd/us/ˈmɔːr.t̬ɚ.bɔːrd/ablackhatwith asquare,flattop,wornforformaloccasionsandceremoniesby someteachersandstudentsat acollegeoruniversity, and in the past by someschoolteachers
(黑色的)方顶帽,学位帽DNY59/iStock/Getty Images Plus/GettyImages
Hats & scarves
- ascot
 - balaclava
 - bandana
 - baseball cap
 - beanie
 - cycle helmet
 - deerstalker
 - dicky bow
 - do-rag
 - dunce's cap
 - kippa
 - mask
 - millinery
 - mitre
 - neckerchief
 - topper
 - toque
 - trencher
 - trilby
 - tuque