/daɪˈægənl ||; daɪˈægənḷ/adj (used about a straight line) joining two sides of sth at an angle that is not 90° or vertical or horizontal （指直线）对角线的: Draw a diagonal line from one corner of the square to the opposite corner. 画一条从正方形的一角到其对角的对角线。 ☞picture at line 见line插图 diagonal noun [C] ➔diagonally /-nəli ||; -nḷɪ/ adv