perpendicular

a Gothic style in 14th and 15th century England; characterized by vertical lines and a four-centered (Tudor) arch and fan vaulting

a cord from which a metal weight is suspended pointing directly to the earth's center of gravity; used to determine the vertical from a given point

at right angles to the plane of the horizon or a base line

“measure the perpendicular height”

an extremely steep face

a straight line at right angles to another line

intersecting at or forming right angles

“the axes are perpendicular to each other”

so steep as to be nearly veritcal

“the great perpendicular face of the cliff”