perpendicular - noun

a straight line at right angles to another line

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

an extremely steep face

perpendicular - adjective

• intersecting at or forming right angles
• at right angles to the plane of the horizon or a base line
• extremely steep

perpendicular - thesaurus

vertical