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Semidiameter :: Semidiameter (n.) Half of a diameter; a right line, or the length of a right line, drawn from the center of a circle, a sphere, or other curved figure, to its circumference or periphery; a radius..

Circlet :: Circlet (n.) A circular piece of wood put under a dish at table.

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

Encompass :: Encompass (v. t.) To circumscribe or go round so as to surround closely; to encircle; to inclose; to environ; as, a ring encompasses the finger; an army encompasses a city; a voyage encompassing the world..

Ecliptic :: Ecliptic (a.) A great circle of the celestial sphere, making an angle with the equinoctial of about 23¡ 28'. It is the apparent path of the sun, or the real path of the earth as seen from the sun..

Trochosphere :: Trochosphere (n.) A young larval form of many annelids, mollusks, and bryozoans, in which a circle of cilia is developed around the anterior end..

Secant :: Secant (a.) A right line drawn from the center of a circle through one end of a circular arc, and terminated by a tangent drawn from the other end; the number expressing the ratio line of this line to the radius of the circle. See Trigonometrical function, under Function..

Enchase :: Enchase (v. t.) To incase or inclose in a border or rim; to surround with an ornamental casing, as a gem with gold; to encircle; to inclose; to adorn..

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

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..

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..

Longitude :: Longitude (n.) The distance in degrees, reckoned from the vernal equinox, on the ecliptic, to a circle at right angles to the ecliptic passing through the heavenly body whose longitude is designated; as, the longitude of Capella is 79¡..

Azimuth :: Azimuth (n.) An arc of the horizon intercepted between the meridian of the place and a vertical circle passing through the center of any object; as, the azimuth of a star; the azimuth or bearing of a line surveying..

Zone :: Zone (v. t.) To girdle; to encircle.

Eccentric :: Eccentric (a.) Not having the same center; -- said of circles, ellipses, spheres, etc., which, though coinciding, either in whole or in part, as to area or volume, have not the same center; -- opposed to concentric..

Meridian :: Meridian (a.) A great circle on the surface of the earth, passing through the poles and any given place; also, the half of such a circle included between the poles..

Symmetrical :: Symmetrical (a.) Having an equal number of parts in the successive circles of floral organs; -- said of flowers.

Circle :: Circle (n.) A territorial division or district.

Atrocha :: Atrocha (n.) A kind of chaetopod larva in which no circles of cilia are developed.

Roundel :: Roundel (a.) A circular spot; a sharge in the form of a small circle.

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