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Pole :: Pole (n.) A point upon the surface of a sphere equally distant from every part of the circumference of a great circle; or the point in which a diameter of the sphere perpendicular to the plane of such circle meets the surface. Such a point is called the pole of that circle; as, the pole of the horizon; the pole of the ecliptic; the pole of a given meridian..

Revolution :: Revolution (n.) The motion of a point, line, or surface about a point or line as its center or axis, in such a manner that a moving point generates a curve, a moving line a surface (called a surface of revolution), and a moving surface a solid (called a solid of revolution); as, the revolution of a right-angled triangle about one of its sides generates a cone; the revolution of a semicircle about the diameter generates a sphere..

Parameter :: Parameter (n.) Specifically (Conic Sections), in the ellipse and hyperbola, a third proportional to any diameter and its conjugate, or in the parabola, to any abscissa and the corresponding ordinate..

Aperture :: Aperture (n.) The diameter of the exposed part of the object glass of a telescope or other optical instrument; as, a telescope of four-inch aperture..

Depressed :: Depressed (a.) Having the vertical diameter shorter than the horizontal or transverse; -- said of the bodies of animals, or of parts of the bodies..

Ellipse :: Ellipse (n.) An oval or oblong figure, bounded by a regular curve, which corresponds to an oblique projection of a circle, or an oblique section of a cone through its opposite sides. The greatest diameter of the ellipse is the major axis, and the least diameter is the minor axis. See Conic section, under Conic, and cf. Focus..

Rafflesia :: Rafflesia (n.) A genus of stemless, leafless plants, living parasitically upon the roots and stems of grapevines in Malaysia. The flowers have a carrionlike odor, and are very large, in one species (Rafflesia Arnoldi) having a diameter of two or three feet..

Chamber :: Chamber (n.) That part of the bore of a piece of ordnance which holds the charge, esp. when of different diameter from the rest of the bore; -- formerly, in guns, made smaller than the bore, but now larger, esp. in breech-loading guns..

Over :: Over (adv.) From one side to another; from side to side; across; crosswise; as, a board, or a tree, a foot over, i. e., a foot in diameter..

Radius :: Radius (n.) A right line drawn or extending from the center of a circle to the periphery; the semidiameter of a circle or sphere.

Telemeter :: Telemeter (n.) An instrument used for measuring the distance of an object from an observer; as, a telescope with a micrometer for measuring the apparent diameter of an object whose real dimensions are known..

Uranus :: Uranus (n.) One of the primary planets. It is about 1,800,000,000 miles from the sun, about 36,000 miles in diameter, and its period of revolution round the sun is nearly 84 of our years..

Longitudinal :: Longitudinal (a.) Extending in length; in the direction of the length; running lengthwise, as distinguished from transverse; as, the longitudinal diameter of a body..

Digit :: Digit (n.) One twelfth part of the diameter of the sun or moon; -- a term used to express the quantity of an eclipse; as, an eclipse of eight digits is one which hides two thirds of the diameter of the disk..

Trunk :: Trunk (n.) A large pipe forming the piston rod of a steam engine, of sufficient diameter to allow one end of the connecting rod to be attached to the crank, and the other end to pass within the pipe directly to the piston, thus making the engine more compact..

Dynameter :: Dynameter (n.) An instrument for determining the magnifying power of telescopes, consisting usually of a doubleimage micrometer applied to the eye end of a telescope for measuring accurately the diameter of the image of the object glass there formed; which measurement, compared with the actual diameter of the glass, gives the magnifying power..

Diametrical :: Diametrical (a.) As remote as possible, as if at the opposite end of a diameter; directly adverse..

Equirotal :: Equirotal (a.) Having wheels of the same size or diameter; having equal rotation.

Systyle :: Systyle (a.) Having a space equal to two diameters or four modules between two columns; -- said of a portico or building. See Intercolumniation.

Calipers :: Calipers (n. pl.) An instrument, usually resembling a pair of dividers or compasses with curved legs, for measuring the diameter or thickness of bodies, as of work shaped in a lathe or planer, timber, masts, shot, etc.; or the bore of firearms, tubes, etc.; -- called also caliper compasses, or caliber compasses..

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