the GNU version of the Collaborative International Dictionary of English
ad. In a perpendicular manner; vertically.
The Century Dictionary and Cyclopedia
In a perpendicular manner; so as to be perpendicular, in any sense of that word.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
ad. in a perpendicular manner
ad. straight up or down without a break
Word Usage
"There was no way of penetrating the island from our cove, for the walls rose perpendicularly from the beach, and, on either side of the cove, rose from the deep water."