PERPENDICULAR (2)

perpendicular (2). Perpendicular, n. anything directly upright

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Per′pen‐dic″u‐lar (?), n. 1. 1. A line at right angles to the plane of the horizon; a vertical line or direction.
2. 2. (Geom.) A line or plane falling at right angles on another line or surface, or making equal angles with it on each side.