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Perpendicular vs Underlayer - What's the difference?

perpendicular | underlayer |

As an adjective perpendicular

is (architecture) of a style of english gothic architecture from the fourteenth and fifteenth centuries.

As a noun underlayer is

a layer that is below another layer.

perpendicular

English

(wikipedia perpendicular)

Adjective

(en adjective)
  • (geometry) At or forming a right angle (to).
  • * {{quote-magazine, date=2012-03
    • , author=(Henry Petroski) , title=Opening Doors , volume=100, issue=2, page=112-3 , magazine= citation , passage=A doorknob of whatever roundish shape is effectively a continuum of levers, with the axis of the latching mechanism—known as the spindle—being the fulcrum about which the turning takes place. Applying a force tangential to the knob is essentially equivalent to applying one perpendicular to a radial line defining the lever.}}
    In most houses, the walls are perpendicular to the floor .

    Synonyms

    * evendown * normal * orthogonal

    Noun

    (en noun)
  • (geometry) A line or plane that is perpendicular to another.
  • A device such as a plumb line that is used in making or marking a perpendicular line.

    • underlayer

    English

    Noun

    (en noun)
  • A layer that is below another layer.
  • (mining) A perpendicular shaft sunk to cut the lode at any required depth.
    • (Weale)
    (Webster 1913)