mortarboard
Word family nounmortarmortarboard
College
mor·tar·board /ˈmɔːtəbɔːd $ ˈmɔːrtərbɔːrd/ noun [countableC] 
SECa black cap with a flat square top worn by members of some universities on formal occasions 学士帽，学位帽 →5 see picture at 见图 hat- Australian
- australian capital territory
- australian-capital-territory
- Australian Capital Territory, the
- Australianism
- australianism
- australian-rules-football
- Australian Rules football
- australians
- Australians
- Austria
- Austrian
- Austrian
- austrians
- Austrians
- Austro-
- austro
- aut-
- autarch
- autarchic
- autarchic
- autarchical
- autarchical
- autarchical
- autarchies
- 操之过切
- 操之过急
- 操之过激
- 操作
- 操作台
- 操作系统
- 操作规程
- 操兵
- 操典
- 操刀
- 操刀伤锦
- 操切
- 操办
- 操劳
- 操场
- 操坪
- 操守
- 操心
- 操戈
- 操扯
- 操持
- 操控
- 操柄
- 操演
- 操理