From Longman Dictionary of Contemporary Englishbe perpendicular to somethingbe perpendicular to somethingHMif one line is perpendicular to another line, they form an angle of 90 degrees SYN at right angles to a road perpendicular to the highway → perpendicular
Examples from the Corpus
be perpendicular to something• This shows the simple case of a spin axis which is perpendicular to the line of sight.• The viewpoint is perpendicular to the orbital plane. 