Meaning of mortarboard

mor•tar•board

Pronunciation: (môr'tur-bôrd", -bōrd"), [key]
— n.
  1. a board, usually square, used by masons to hold mortar.
  2. Also calleda cap with a close-fitting crown surmounted by a stiff, flat, square piece from which a tassel hangs, worn as part of academic costume.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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