IPA: //ˈmɔːrtərbɔːrd//
KK: /ˈmɔrtərˌbɔrd/
A type of cap worn during graduation ceremonies, which has a flat square top and a tassel.
She wore her mortarboard proudly as she walked across the stage to receive her diploma.
Mortarboard is formed from "mortar" (from Old French *mortier*, meaning a bowl or vessel for mixing) and "board" (from Old English *bord*, meaning a flat piece of material). The word refers to a flat, square cap worn during graduation ceremonies, symbolizing the mixing of knowledge and learning, much like mortar is used to bind materials together.
Think of a 'bowl' ('mortar') used for mixing and a 'flat piece' ('board') of material — this helps you remember that a mortarboard is a flat cap worn during graduation, symbolizing the blending of knowledge.