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parallelogram (n.)

"quadrilateral whose opposite sides are parallel," 1560s, from French parallélogramme (1550s) and directly from Late Latin parallelogrammum, from Greek parallelogrammon noun use of a neuter adjective meaning "bounded by parallel lines," from parallelos (see parallel) + stem of graphein "to write" (see -graphy). Related: Parallelogrammic; parallelogramical.

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Definitions of parallelogram from WordNet

parallelogram (n.)
a quadrilateral whose opposite sides are both parallel and equal in length;
From wordnet.princeton.edu