• noun:   an extremely steep face
• noun:   a Gothic style in 14th and 15th century England; characterized by vertical lines and a four-centered (Tudor) arch and fan vaulting
• noun:   a straight line at right angles to another line
• noun:   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
• adjective:   intersecting at or forming right angles

  Example: "The axes are perpendicular to each other"

• adjective:   extremely steep

  Example: "The great perpendicular face of the cliff"

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

  Example: "Measure the perpendicular height"

Related words...