"perpendicular" in the noun sense
1. perpendicular
a straight line at right angles to another line
2. perpendicular, perpendicular style, English-Gothic, English-Gothic architecture
a Gothic style in 14th and 15th century England characterized by vertical lines and a four-centered (Tudor) arch and fan vaulting
3. plumb line, perpendicular
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
4. perpendicular
an extremely steep face
"perpendicular" in the adjective sense
1. perpendicular
intersecting at or forming right angles
"the axes are perpendicular to each other"
2. vertical, perpendicular
at right angles to the plane of the horizon or a base line
"a vertical camera angle"
"the monument consists of two vertical pillars supporting a horizontal slab"
"measure the perpendicular height"
3. perpendicular
so steep as to be nearly veritcal
"the great perpendicular face of the cliff"
Source: WordNet® (An amazing lexical database of English)
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