Definitions for "mortarboard"
Keywords:  tassel, academic, cap, headgear, masons
A small square board with a handle beneath, for holding mortar; a hawk; used by masons to hold or carry mortar.
An academic cap topped by broad, projecting, stiff and flat square top, with a tassel attached to the top and hanging down. It was once worn by students in some colleges, but is now worn usually only at graduation ceremonies.
an academic cap with a flat square with a tassel on top