exterior : Idioms & Phrases
Exterior angle
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noun the supplement of an interior angle of a polygon
external angle.
WordNet
(Geom.) , the angle included between any side of a triangle or polygon and the prolongation of the adjacent side; also, an angle included between a line crossing two parallel lines and either of the latter on the outside.
Webster 1913
exterior door
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noun a doorway that allows entrance to or exit from a building
outside door.
WordNet
Exterior side
(Fort.) , the side of the polygon upon which a front of fortification is formed.