perpendicular
US /ˌpə:pənˈdɪkjəlɚ/
・UK /ˌpɜ:pənˈdɪkjələ(r)/
C1
adjective
- Being at right angles to a given line or plane
- At an angle of 90° to a given line, plane, or surface.
- In a straight up and down direction; vertical.
noun
- A line at right angles to a given line, plane, or surface.