par·al·lel·o·gram
noun/ˌpærəˈleləɡræm/
/ˌpærəˈleləɡræm/
(geometry)- a flat shape with four straight sides, the opposite sides being the same distance apart at every point and equal to each other
enlarge image平行四边形 Word Originlate 16th cent.: from French parallélogramme, via late Latin from Greek parallēlogrammon, from parallēlos ‘alongside another’ + grammē ‘line’.