mortarboard

英 ['mɔːtəbɔːd] 美 ['mɔrtɚ,bord]
  • n. 学位帽；灰泥板
mortarboard
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英文词源

mortarboard (n.)
also mortar-board, "academic cap," 1854, probably from mortar (1) + board (n.1); so called because it resembles a mason's square board for carrying mortar. Earlier it was called a mortar cap (1680s) or simply morter (c. 1600), from French mortier.