(archaic) To ponder, consider.

A brick or stone that has its longest dimension perpendicular to the face of a wall, especially one that extends through the wall's entire thickness.

simple past tense and past participle of perpend

present participle of perpend

Third-person singular simple present indicative form of perpend

plural of perpend

A large stone reaching through a wall so as to appear on both sides of it, and acting as a binder.

plural of perpender

(geometry) at or forming a right angle (to something). / Exactly upright; extending in a straight line toward the centre of the earth, etc. / Independent of or irrelevant to each other; orthogonal.

(geometry) A line or plane that is perpendicular to another. / A device such as a plumb line that is used in making or marking a perpendicular line.