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Definition of: quadrilateral
(kwod′rə·lat′ər·əl) adjective
Formed or bounded by four lines; four-sided.
—noun
1. Geom. a A figure bounded by four straight lines terminated at four angles. b A figure formed of four infinite straight lines, having six intersections.
2. A space or area defended by four enclosing fortresses. [<L quadrilaterus <quattuor four + latus, lateris side]
abdc. Quadrilateral.
ad., bc. Diagonals.
ebfc. Quadrilateral.
a., b., c., d., f. Vertices.
ai., bh., ei. Diagonals.
g., hh., i. Centers.
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