perpendicularly

adverb (r)

1. straight up or down without a break (adv.all)

   Sumber: wordnet30

2. in a perpendicular manner (adv.all)

   This red line runs perpendicularly to the green line

   Sumber: wordnet30

3. In a perpendicular manner; vertically. (adverb)

   Sumber: webster1913