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Definition of: parallelogram
(par′ə·lel′ə·gram) noun
1. Geom. A four-sided plane figure whose opposite sides are parallel and equal, including the square, rectangle, rhombus, and rhomboid.
2. Any area or object having such form. [<F parallélogramme <L parallelogrammum <Gk. parallēlogrammon, orig. adj., bounded by parallel lines <parallēlos parallel + grammē a line]
a. Square. b. Rectangle. c. Rhombus. d. Rhomboid.
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