parallellogram

Noun

 * 1) parallelogram (convex quadrilateral in which each pair of opposite edges are parallel and of equal length)

Etymology
From, from , neuter of , from +.

Noun

 * 1)  a parallelogram (convex quadrilateral in which each pair of opposite edges are parallel and of equal length).

Usage notes

 * Only common gender is listed in sources, but neuter gender appears to be more common among private people.