• adj. 垂直的，正交的；直立的；陡峭的
• n. 垂線；垂直的位置

per-,整個的，-pend,懸掛，詞源同depend,pendulum.引申詞義垂直的。

perpendicular

perpendicular: see pendulum

perpendicular (adj.)

late 15c., from adverb (late 14c.), from Old French perpendiculer, from Latin perpendicularis "vertical, as a plumb line," from perpendiculum "plumb line," from perpendere "balance carefully," from per- "thoroughly" (see per) + pendere "to weigh, to hang" (see pendant). As a noun from 1570s. Related: Perpendicularly; perpendicularity.

1. The left wing dipped until it was perpendicular to the ground.

左翼下垂至與地面成90度角。

來自柯林斯例句

2. Are the lines perpendicular to each other?

這些直線相互垂直嗎？

來自《權威詞典》

3. The two lines of bones are set perpendicular to one another.

這兩排骨頭相互垂直.

來自《簡明英漢詞典》

4. The plumbline is always perpendicular to the horizontal plane.

鉛垂線總是垂直于水平面的.

來自《現代英漢綜合大詞典》

5. Let AB be perpendicular to CD.

設AB垂直于CD.

來自《現代漢英綜合大詞典》