adjective uk
/ˌpɜː.pənˈdɪk.jʊ.lər/ us
/ˌpɝː.pənˈdɪk.juː.lɚ/

› formal at an angle of 90° to a horizontal line or surface: We scrambled up the nearly perpendicular side of the mountain.Describing angles, lines and orientationsUp and upwardMoving upwards › specialized mathematics at an angle of 90° to another line or surface: The wheel rotates about an axis which is perpendicular to the plane.Describing angles, lines and orientations

perpendicularly

adverb uk
/-li/ formal or specialized us

› a perpendicular line: Draw a perpendicular from the vertex of the triangle to its base.Describing angles, lines and orientations the perpendicular › a perpendicular position or direction: The wall was leaning at an angle of ten degrees to the perpendicular.Describing angles, lines and orientations

(Definition of perpendicular from the Cambridge Advanced Learners Dictionary & Thesaurus
© Cambridge University Press)

What is the pronunciation of perpendicular?
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