Defn: A large stone reaching through a wall so as to appear on both sides of it, and acting as a binder; — called also perbend, perpend stone, and perpent stone.
PERPENDICLE Per*pen"di*cle, n. Etym: [L. perpendiculum; per + pendere to hang: cf. F. perpendicule.]
Defn: Something hanging straight down; a plumb line. [Obs.]
PERPENDICULAR Per`pen*dic"u*lar, a. Etym: [L. perpendicularis, perpendicularius: cf. F. perpendiculaire. See Perpendicle, Pension.]
1. Exactly upright or vertical; 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.)
Defn: At right angles to a given line or surface; as, the line ad is perpendicular to the line bc. Perpendicular style (Arch.), a name given to the latest variety of English Gothic architecture, which prevailed from the close of the 14th century to the early part of the 16th; — probably so called from the vertical style of its window mullions.
PERPENDICULAR
Per`pen*dic"u*lar, n.
1. A line at right angles to the plane of the horizon; a vertical line or direction.
2. (Geom.)