查询结果:

adj. 垂直的,成直角的
n. 垂线 

拆分: per-贯穿,通过 + -pend-垂 + -i- + -cular形容词词尾

辨异:
vertical, perpendicular 
vertical指与水平线垂直,反义词是horizontal;
perpendicular则指与任何线条或平面垂直。

例:
to draw a line perpendicular to a given line 作一直线与已知直线垂直 
The plumbline is always perpendicular to the horizontal plane. 铅垂线总是垂直于水平面的。 
The wall is out of the perpendicular. 这墙有些倾斜。 
The axis of the moon will now be exactly perpendicular to that of the earth. 月轴此时与地轴将正好成直角。 
two mutually perpendicular directions 两个互为直角的方向