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rhomboidal adj.【數學】偏菱形的,長斜方形的。

rhomboideus

During the song and yuan dynasties the bronze mirrors appeared in all shapes : round , rectangular , rhomboidal , octagonal , and those with a handle 宋、元時期出現了圓鏡、長方鏡、棱鏡、八棱鏡和帶柄手鏡等。