PARALLELOGRAM
parallelogram
(noun) a quadrilateral whose opposite sides are both parallel and equal in length
Source: WordNet® 3.1
Etymology
Noun
parallelogram (plural parallelograms)
(geometry) A convex quadrilateral in which each pair of opposite edges are parallel and of equal length.
(Gaelic games, dated) either of two rectangular areas (respectively the large parallelogram and the small parallelogram) abutting the goal line in front of the goal. (Since 1986 officially named the large rectangle and small rectangle, though the older names are still occasionally used.)
Hypernyms
• (geometry): quadrilateral, quadrangle, tetragon, polygon
Hyponyms
• (geometry): rectangle, rhombus, square, rhomboid
Source: Wiktionary
Par`al*lel"o*gram, n. Etym: [Gr. parallélogramme. See Parallel, and -
gram.] (Geom.)
Definition: A right-lined quadrilateral figure, whose opposite sides are
parallel, and consequently equal; -- sometimes restricted in popular
usage to a rectangle, or quadrilateral figure which is longer than it
is broad, and with right angles. Parallelogram of velocities, forces,
accelerations, momenta, etc. (Mech.), a parallelogram the diagonal of
which represents the resultant of two velocities, forces,
accelerations, momenta, etc., both in quantity and direction, when
the velocities, forces, accelerations, momenta, etc., are represented
in quantity and direction by the two adjacent sides of the
parallelogram.
Source: Webster’s Unabridged Dictionary 1913 Edition