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Webster 1913 Edition
Parallelogram
Parˊal-lel′o-gram
,Noun.
[Gr. [GREEK]; [GREEK] parallel + [GREEK] to write: cf. F.
parallélogramme
. See Parallel
, and -gram
.] (Geom.)
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
, parallelogram of forces
, parallelogram of accelerations
, parallelogram of 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.
Webster 1828 Edition
Parallelogram
PARALLEL'OGRAM
,Noun.
1.
In geometry, a right lined quadrilateral figure, whose opposite sides are parallel and equal.2.
In common use,this word is applied to quadrilateral figures of more length than breadth, and this is its sense in the passage cited by Johnson from Brown.