perpendicular

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per|pen|dicu|lar /p'ɜːrpənd'ɪkjʊlər/
1 [ADJ] usu ADJ n
A perpendicular line or surface points straight up, rather than being sloping or horizontal.
We made two slits for the eyes and a perpendicular line for the nose...
The sides of the loch are almost perpendicular.
= vertical
2 [ADJ] usu v-link ADJ to n
If one thing is perpendicular to another, it is at an angle of 90 degrees to it. (FORMAL)
The left wing dipped until it was perpendicular to the ground.

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