mortarboard

Noun
  1. A square board with a handle underneath;
    Used by masons to hold or carry mortar (synset 103792697)
    is a type of: board - a flat piece of material designed for a special purpose
    same as: hawk
  2. An academic cap with a flat square with a tassel on top (synset 103792565)
    is a type of: cap - a tight-fitting headdress
    is a part of: academic costume - a costume worn on formal occasions by the faculty or students of a university or college

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