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.

(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.) A line or plane falling at right angles on another line or surface, or making equal angles with it on each side.

(Per`o*ne"al) a. [Gr. the fibula.] (Anat.) Of or pertaining to the fibula; in the region of the fibula.

(Per"o*rate) v. i. [See Peroration.] To make a peroration; to harangue. [Colloq.]

(Per`o*ra"tion) n. [L. peroratio, fr. perorate, peroratum, to speak from beginning to end; per + orate to speak. See Per-, and Oration.] (Rhet.) The concluding part of an oration; especially, a final summing up and enforcement of an argument. Burke.

(Per*ox`i*da"tion) n. Act, process, or result of peroxidizing; oxidation to a peroxide.

(Per*ox"ide) n. (Chem.) An oxide containing more oxygen than some other oxide of the same element. Formerly peroxides were regarded as the highest oxides. Cf. Per-, 2.

(Per*ox"i*dize) v. t. [imp. & p. p. Peroxidized ; p. pr. & vb. n. Peroxidizing.] (Chem.) To oxidize to the utmost degree, so as to form a peroxide.

(Per*pend") v. t. [L. perpendere, perpensum; per + pendere to weight.] To weight carefully in the mind. [R.] "Perpend my words." Shak.

(Per*pend"), v. i. To attend; to be attentive. [R.] Shak.

(Per*pend"er) n. [F. parpaing, pierre parpaigne; of uncertain origin.] (Masonry) 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.

(Per*pen"di*cle) n. [L. perpendiculum; per + pendere to hang: cf. F. perpendicule.] Something hanging straight down; a plumb line. [Obs.]

(Per`pen*dic"u*lar) a. [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.) At right angles to a given line or surface; as, the line ad is perpendicular to the line bc.

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