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Designating, or pert. to, a gear for reducing or increasing a velocity ratio two to one.

A directed quantity, as a straight line, a force, or a velocity. Vectors are said to be equal when their directions are the same their magnitudes equal. Cf. Scalar.

(of a force) (Mech.), the product of the intensity of the force multiplied by the virtual velocity of its point of application; -- sometimes called virtual work. -- Virtual velocity (Mech.), a minute hypothetical displacement, assumed in analysis to facilitate the investigation of statical problems. With respect to an…

a body in motion is brought to rest, or has its motion changed, either in direction or in velocity.

rature of the air, the relative humidity, the state of the weather, and the direction and velocity of the wind. Isobars and isotherms outline the general distribution of temperature and pressure, while shaded areas indicate the sections over which rain has just fallen. Other lines inclose areas where the temperature ha…

To turn round rapidly; to cause to rotate with velocity; to make to revolve. He whirls his sword around without delay. Dryden.

ind of wooden cage turning on a pivot, in which the offender was whirled round with great velocity.

To move nimbly at with velocity; to make a sudden agile movement.

A humming or whirring sound, like that of a body moving through the air with velocity; a whir.

Air naturally in motion with any degree of velocity; a current of air. Except wind stands as never it stood, It is an ill wind that turns none to good. Tusser . Winds were soft, and woods were green. Longfellow.

rted by, or flying with, the wings another. -- On the wings of the wind, with the utmost velocity. -- Under the wing, or wings, of, under the care or protection of. -- Wing and wing (Naut.), with sails hauled out on either side; -- said of a schooner, or her sails, when going before the wind with the foresail on one…