a quadrilateral having both pairs of opposite sides parallel to each other.

1560–70; < Late Latin parallēlogrammum < Greek parallēlógrammon. See parallel, -o-, -gram1

parallelogrammatic [par-uh-lel-uh-gruh-mat-ik] , parallelogrammatical, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
parallelogram (ˌpærəˈlɛləˌɡræm)
rhombus rectangle trapezium See also trapezoid a quadrilateral whose opposite sides are parallel and equal in length
[C16: via French from Late Latin, from Greek parallēlogrammon, from parallēlosparallel + grammē line, related to graphein to write]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
parallelogram   (pār'ə-lěl'ə-grām')  Pronunciation Key 
A four-sided plane figure with opposite sides parallel. Rhombuses and rectangles are parallelograms.
The American Heritage® Science Dictionary
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