plural of parallelogram

(geometry) A convex quadrilateral in which each pair of opposite edges are parallel and of equal length.

parallelogramic

Having the form or properties of a parallelogram

plural of parallelogram of forces

(mechanics) A parallelogram, two adjacent sides of which are vectors having the same initial point and representing two forces acting simultaneously upon this point, such that the resultant of the forces is given by the diagonal of the parallelogram that passes through this point.