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Ellipsoid :: Ellipsoid (n.) A solid, all plane sections of which are ellipses or circles. See Conoid, n., 2 (a)..

Pendentive :: Pendentive (n.) The portion of a vault by means of which the square space in the middle of a building is brought to an octagon or circle to receive a cupola.

Semicircle :: Semicircle (n.) A body in the form of half of a circle, or half of a circumference..

Unity :: Unity (n.) Any definite quantity, or aggregate of quantities or magnitudes taken as one, or for which 1 is made to stand in calculation; thus, in a table of natural sines, the radius of the circle is regarded as unity..

Circuit :: Circuit (n.) The act of moving or revolving around, or as in a circle or orbit; a revolution; as, the periodical circuit of the earth round the sun..

Heterotricha :: Heterotricha (n. pl.) A division of ciliated Infusoria, having fine cilia all over the body, and a circle of larger ones around the anterior end..

Circle :: Circle (n.) A round body; a sphere; an orb.

Semicircle :: Semicircle (n.) The half of a circle; the part of a circle bounded by its diameter and half of its circumference.

Homography :: Homography (n.) A relation between two figures, such that to any point of the one corresponds one and but one point in the other, and vise versa. Thus, a tangent line rolling on a circle cuts two fixed tangents of the circle in two sets of points that are homographic..

Quadrantal :: Quadrantal (a.) Of or pertaining to a quadrant; also, included in the fourth part of a circle; as, quadrantal space..

Radian :: Radian (n.) An arc of a circle which is equal to the radius, or the angle measured by such an arc..

Equatorial :: Equatorial (n.) An instrument consisting of a telescope so mounted as to have two axes of motion at right angles to each other, one of them parallel to the axis of the earth, and each carrying a graduated circle, the one for measuring declination, and the other right ascension, or the hour angle, so that the telescope may be directed, even in the daytime, to any star or other object whose right ascension and declination are known. The motion in right ascension is sometimes communicated by clockw

Horizon :: Horizon (n.) The circle which bounds that part of the earth's surface visible to a spectator from a given point; the apparent junction of the earth and sky.

Planisphere :: Planisphere (n.) The representation of the circles of the sphere upon a plane; especially, a representation of the celestial sphere upon a plane with adjustable circles, or other appendages, for showing the position of the heavens, the time of rising and setting of stars, etc., for any given date or hour..

Around :: Around (adv.) In a circle; circularly; on every side; round.

Incommensurable :: Incommensurable (a.) Not commensurable; having no common measure or standard of comparison; as, quantities are incommensurable when no third quantity can be found that is an aliquot part of both; the side and diagonal of a square are incommensurable with each other; the diameter and circumference of a circle are incommensurable..

Roundel :: Roundel (a.) Anything having a round form; a round figure; a circle.

Palladium :: Palladium (n.) A rare metallic element of the light platinum group, found native, and also alloyed with platinum and gold. It is a silver-white metal resembling platinum, and like it permanent and untarnished in the air, but is more easily fusible. It is unique in its power of occluding hydrogen, which it does to the extent of nearly a thousand volumes, forming the alloy Pd2H. It is used for graduated circles and verniers, for plating certain silver goods, and somewhat in dentistry. It was so na

Altitude :: Altitude (n.) The elevation of a point, or star, or other celestial object, above the horizon, measured by the arc of a vertical circle intercepted between such point and the horizon. It is either true or apparent; true when measured from the rational or real horizon, apparent when from the sensible or apparent horizon..

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.

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