perpendicular
noun/ˌpɜːpənˈdɪkjələ(r)/
/ˌpɜːrpənˈdɪkjələr/
the perpendicular
[singular]- a line, position or direction that is exactly perpendicular
- The wall is a little out of the perpendicular.
Word Originlate Middle English (as an adverb meaning ‘at right angles’): via Old French from Latin perpendicularis, from perpendiculum ‘plumb line’, from per- ‘through’ + pendere ‘to hang’.
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perpendicular