Definition of parallelogram noun from the Oxford Advanced Learner's Dictionary

 

parallelogram

 noun
noun
BrE BrE//ˌpærəˈleləɡræm//
 
; NAmE NAmE//ˌpærəˈleləɡræm//
 
(geometry)
 
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a flat shape with four straight sides, the opposite sides being parallel and equal to each other Word Origin late 16th cent.: from French parallélogramme, via late Latin from Greek parallēlogrammon, from parallēlos ‘alongside another’ + grammē ‘line’.
See the Oxford Advanced American Dictionary entry: parallelogram