adverb
- Straight up or down without a break.
- synonyms: sheer
- In a perpendicular manner.
- usage: "this red line runs perpendicularly to the green line"
Rectangularly and Perpendicularly
WordNet 3.0 © 2006 by Princeton University
(adv.) In a perpendicular manner; vertically.
Webster's Revised Unabridged Dictionary
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