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Almacantar :: Almacantar (n.) A recently invented instrument for observing the heavenly bodies as they cross a given almacantar circle. See Almucantar.

Round :: Round (n.) Anything round, as a circle, a globe, a ring. The golden round [the crown]..

Ring :: Ring (n.) A circle, or a circular line, or anything in the form of a circular line or hoop..

Elevation :: Elevation (n.) The distance of a celestial object above the horizon, or the arc of a vertical circle intercepted between it and the horizon; altitude; as, the elevation of the pole, or of a star..

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..

Equator :: Equator (n.) The imaginary great circle on the earth's surface, everywhere equally distant from the two poles, and dividing the earth's surface into two hemispheres..

Purl :: Purl (n.) A circle made by the notion of a fluid; an eddy; a ripple.

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

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..

Demicircle :: Demicircle (n.) An instrument for measuring angles, in surveying, etc. It resembles a protractor, but has an alidade, sights, and a compass..

Tangent :: Tangent (v. t.) A tangent line curve, or surface; specifically, that portion of the straight line tangent to a curve that is between the point of tangency and a given line, the given line being, for example, the axis of abscissas, or a radius of a circle produced. See Trigonometrical function, under Function..

Circular :: Circular (a.) Adhering to a fixed circle of legends; cyclic; hence, mean; inferior. See Cyclic poets, under Cyclic..

Roundabout :: Roundabout (n.) A dance performed in a circle.

Round :: Round (adv.) Through a circle, as of friends or houses..

Spherograph :: Spherograph (n.) An instrument for facilitating the practical use of spherics in navigation and astronomy, being constructed of two cardboards containing various circles, and turning upon each other in such a manner that any possible spherical triangle may be readily found, and the measures of the parts read off by inspection..

Vorticella :: Vorticella (n.) Any one of numerous species of ciliated Infusoria belonging to Vorticella and many other genera of the family Vorticellidae. They have a more or less bell-shaped body with a circle of vibrating cilia around the oral disk. Most of the species have slender, contractile stems, either simple or branched..

Sabella :: Sabella (n.) A genus of tubicolous annelids having a circle of plumose gills around the head.

Circle :: Circle (n.) Compass; circuit; inclosure.

O :: O (n.) Something shaped like the letter O; a circle or oval.

Azimuth :: Azimuth (n.) The quadrant of an azimuth circle.

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