'Perpendicularly' definitions:

Definition of 'perpendicularly'

(from WordNet)
adverb
Straight up or down without a break [syn: sheer, perpendicularly]
adverb
In a perpendicular manner; "this red line runs perpendicularly to the green line"

Definition of 'Perpendicularly'

From: GCIDE
  • Perpendicularly \Per`pen*dic"u*lar*ly\, adv. In a perpendicular manner; vertically. [1913 Webster]