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Screw :: Screw (n.) A straight line in space with which a definite linear magnitude termed the pitch is associated (cf. 5th Pitch, 10 (b)). It is used to express the displacement of a rigid body, which may always be made to consist of a rotation about an axis combined with a translation parallel to that axis..

Gyroscope :: Gyroscope (n.) A rotating wheel, mounted in a ring or rings, for illustrating the dynamics of rotating bodies, the composition of rotations, etc. It was devised by Professor W. R. Johnson, in 1832, by whom it was called the rotascope..

Trochoid :: Trochoid (a.) Admitting of rotation on an axis; -- sometimes applied to a pivot joint like that between the atlas and axis in the vertebral column.

Cylinder :: Cylinder (n.) A solid body which may be generated by the rotation of a parallelogram round one its sides; or a body of rollerlike form, of which the longitudinal section is oblong, and the cross section is circular..

Swivel :: Swivel (a.) A piece, as a ring or hook, attached to another piece by a pin, in such a manner as to permit rotation about the pin as an axis..

Twirl :: Twirl (n.) The act of twirling; a rapid circular motion; a whirl or whirling; quick rotation.

Wabble :: Wabble (v. i.) To move staggeringly or unsteadily from one side to the other; to vacillate; to move the manner of a rotating disk when the axis of rotation is inclined to that of the disk; -- said of a turning or whirling body; as, a top wabbles; a buzz saw wabbles..

Translation :: Translation (n.) Motion in which all the points of the moving body have at any instant the same velocity and direction of motion; -- opposed to rotation.

Rotation :: Rotation (a.) Pertaining to, or resulting from, rotation; of the nature of, or characterized by, rotation; as, rotational velocity..

Revolution :: Revolution (n.) The act of revolving, or turning round on an axis or a center; the motion of a body round a fixed point or line; rotation; as, the revolution of a wheel, of a top, of the earth on its axis, etc..

Whirl :: Whirl (v. t.) A turning with rapidity or velocity; rapid rotation or circumvolution; quick gyration; rapid or confusing motion; as, the whirl of a top; the whirl of a wheel..

Rotatory :: Rotatory (a.) Producing rotation of the plane of polarization; as, the rotatory power of bodies on light. See the Note under polarization..

Circumrotation :: Circumrotation (n.) The act of rolling or revolving round, as a wheel; circumvolution; the state of being whirled round..

Verticity :: Verticity (n.) The quality or power of turning; revolution; rotation.

Rotative :: Rotative (a.) turning, as a wheel; rotary; rotational..

Rotation :: Rotation (n.) The act of turning, as a wheel or a solid body on its axis, as distinguished from the progressive motion of a revolving round another body or a distant point; thus, the daily turning of the earth on its axis is a rotation; its annual motion round the sun is a revolution..

Rolling :: Rolling (a.) Rotating on an axis, or moving along a surface by rotation; turning over and over as if on an axis or a pivot; as, a rolling wheel or ball..

Operameter :: Operameter (n.) An instrument or machine for measuring work done, especially for ascertaining the number of rotations made by a machine or wheel in manufacturing cloth; a counter..

Following :: Following (a.) (In the field of a telescope) In the direction from which stars are apparently moving (in consequence of the earth's rotation); as, a small star, north following or south following. In the direction toward which stars appear to move is called preceding..

Couple :: Couple (a.) Two rotations, movements, etc., which are equal in amount but opposite in direction, and acting along parallel lines or around parallel axes..

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