n.
Pronunciation: ˌ pa-r ə - ' le-l ə - ˌ gram
Function: noun
Etymology: Late Latin or Greek; Late Latin parallelogrammum, from Greek parall ē logrammon, from neuter of parall ē logrammos bounded by parallel lines, from parall ē los + gramm ē line, from graphein to write ― more at CARVE
Date: 1570
: a quadrilateral with opposite sides parallel and equal