• adj. 斜的；对角线的；斜纹的
• n. 对角线；斜线

dia-, 穿过。-gon, 弯，角，词源同knee, octagonal. 即穿过去的，成对角的。

diagonal

diagonal: [16] Diagonal is commonly used simply as a synonym for oblique, but in strict mathematical terms it denotes a line joining two non-adjacent angles of a polygon. This reveals far more clearly its origins. It comes from diagōnālis, a Latin adjective derived from Greek diagónios. This was a compound formed from the prefix dia- ‘across’ and gōníā ‘angle’ (as in English polygon), meaning ‘from angle to angle’. Gōníā is related ultimately to English knee and genuine.
=> genuine, knee, polygon

diagonal (adj.)

1540s (implied in diagonally), from Middle French diagonal, from Latin diagonalis, from diagonus "slanting line," from Greek diagonios "from angle to angle," from dia- "across" (see dia-) + gonia "angle" (see -gon). As a noun, from 1570s.

1. The book has a diagonal black stripe on the cover.

书的封面上有条连接对角的黑斜线.

来自《简明英汉词典》

2. Footsteps had scored a diagonal path through the snow.

脚印在雪地上留下了一条对角线.

来自《简明英汉词典》

3. Draw a diagonal line to divide the square into two triangles.

画一条对角线,把正方形分成两个三角形.

来自辞典例句

4. The lumped mass matrix is a diagonal matrix.

集中质量阵是一个对用阵.

来自辞典例句

5. The square matrix is called a diagonal matrix.

该方矩阵称为对角矩阵.

来自辞典例句