A four-sided → polygon whose opposite sides are parallel.
A parallelogram all of whose angles are right angles is a
From Fr. parallélogramme, from L. parallelogrammum, from
Gk. parallelogrammon "bounded by parallel lines," from parallelos,
→ parallel, + gramme "line," related to
graphein "to write, draw" → -graph.
Parâsubar, from parâsu, → parallel, +
bar, → side.