Science Dictionary
perpendicular   (pûr'pən-dĭk'yə-lər)  Pronunciation Key 
Adjective   Intersecting at or forming a right angle or right angles.

Noun   A line or plane that is perpendicular to a given line or plane.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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