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.

Parallelogrammatic
(Par`al*lel`o*gram*mat"ic) a. Of or pertaining to a parallelogram; parallelogrammic.

Parallelogrammic
(Par`al*lel`o*gram"mic) Parallelogrammical
(Par`al*lel`o*gram"mic*al) a. Having the properties of a parallelogram. [R.]

Parallelopiped
(Par`al*lel`o*pi"ped) n. [Gr. a body with parallel surfaces; parallel + a plane surface, on the ground, or level with it, level, flat; on + the ground: cf. F. parallélopipède.] (Geom.) A solid, the faces of which are six parallelograms, the opposite pairs being parallel, and equal to each other; a prism whose base is a parallelogram.

Parallelopipedon
(Par`al*lel`o*pip"e*don) n. [NL.] A parallelopiped. Hutton.

Paralogical
(Par`a*log"ic*al) a. Containing paralogism; illogical. "Paralogical doubt." Sir T. Browne.

Paralogism
(Pa*ral"o*gism) n. [Gr. fr. to reason falsely; para` beside + to reason, discourse, reason: cf. F. paralogisme.] (Logic) A reasoning which is false in point of form, that is, which is contrary to logical rules or formulæ; a formal fallacy, or pseudo- syllogism, in which the conclusion does not follow from the premises.

Paralogize
(Pa*ral"o*gize) v. i. [imp. & p. p. Paralogized ; p. pr. & vb. n. Paralogizing ] To reason falsely; to draw conclusions not warranted by the premises. [R.]

Parallelable
(Par"al*lel`a*ble) a. Capable of being paralleled, or equaled. [R.] Bp. Hall.

Parallelism
(Par"al*lel*ism) n. [Gr. fr. to place side by side, or parallel: cf. F. parallélisme.]

1. The quality or state of being parallel.

2. Resemblance; correspondence; similarity.

A close parallelism of thought and incident.
T. Warton.

3. Similarity of construction or meaning of clauses placed side by side, especially clauses expressing the same sentiment with slight modifications, as is common in Hebrew poetry; e. g.: —

At her feet he bowed, he fell:
Where he bowed, there he fell down dead.
Judg. v. 27.

Parallelistic
(Par`al*lel*is"tic) a. Of the nature of a parallelism; involving parallelism.

The antithetic or parallelistic form of Hebrew poetry is entirely lost.
Milman.

Parallelize
(Par"al*lel*ize) v. t. To render parallel. [R.]

Parallelless
(Par"al*lel*less), a. Matchless. [R.]

Parallelly
(Par"al*lel*ly), adv. In a parallel manner; with parallelism. [R.] Dr. H. More.

Parallelogram
(Par`al*lel"o*gram) n. [Gr. parallel + 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.

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