An Encylopedia Britannica Company

mortarboard

1 ENTRIES FOUND:
mortarboard /ˈmoɚtɚˌboɚd/ noun
plural mortarboards
mortarboard
/ˈmoɚtɚˌboɚd/
noun
plural mortarboards
Britannica Dictionary definition of MORTARBOARD
[count]
: a hat with a flat square top that is worn for special ceremonies at some schools