As  perpendicular  as...

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Definition of perpendicular

perpendicular - adj. extremely steep; intersecting at or forming right angles; at right angles to the plane of the horizon or a base line; noun an extremely steep face; a Gothic style in 14th and 15th century England; characterized by vertical lines and a four-centered (Tudor) arch and fan vaulting; a straight line at right angles to another line; 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.

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