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Webster's Dictionary (1865)

2 entries under this word

Perpendicular

Pēr'pen-dī'e'ū-lar, a.

adjective

a. [Lat. perpendicularis, perpendicularis, Fr. perpendiculaire, Pr., Sp., & Pg. perpendicular, It. perpendicolare. See supra.]

  1. Exactly upright; pointing to the zenith; at right angles to the plane of the horizon; extending in a right line from any point toward the center of the earth.
  2. (Geom.) At right angles to a given line or surface; as, the line a d is perpendicular to the line b c.

Pēr'pen-dĭc'ū-lar, n.

noun

n. 1. A line at right angles to the plane of the horizon; a vertical line or direction. 2. (Geom.) A line or plane falling at right angles on another line or surface, or making equal angles with it on each side.