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Noun: parallelogram  ,per-u'le-lu,gram [N. Amer], ,pa-ru'le-lu,gram [Brit]
  1. A quadrilateral whose opposite sides are both parallel and equal in length
    "the shear changed the rectangle into a parallelogram"

Derived forms: parallelograms

Type of: quadrangle, quadrilateral, tetragon

Antonym: trapezium [N. Amer]

Encyclopedia: Parallelogram