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Synonyms
per·pen·dic·u·lar (pûŕpən-dĭḱyə-lər)

[Middle English perpendiculer, from Old French, from Latin perpendiculāris, from perpendiculum, plumb line, from perpendere, to weigh carefully, per-, per-, + pendere, to weigh.]

adjective 

  1. Mathematics Intersecting at or forming right angles.
  2. Being at right angles to the horizontal; vertical. See synonyms at vertical
  3. Of or relating to a style of English Gothic architecture of the 14th and 15th centuries, characterized by emphasis of the vertical element.

adverb 

In a perpendicular position.

noun 

  1. Mathematics A line or plane perpendicular to a given line or plane.
  2. A perpendicular position.
  3. A device, such as a plumb line, used in marking the vertical from a given point.
  4. A vertical or nearly vertical line or plane.

derivatives

peŕpen·diću·laŕi·ty
noun
peŕpen·diću·lar·ly
adverb