trapezoidn. 梯形、不規則四邊形斜方形的、小多角骨學術名詞梯形:數學、工程圖學、植物學小多角骨【即第二腕骨】:比較解剖學梯形體:機械工程英文釋義a quadrilateral with two parallel sidesthe wrist bone between the trapezium and the capitate bones