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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

Rigol :: Rigol (n.) A circle; hence, a diadem..

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..

Lune :: Lune (n.) A figure in the form of a crescent, bounded by two intersecting arcs of circles..

Belted :: Belted (a.) Encircled by, or secured with, a belt; as, a belted plaid; girt with a belt, as an honorary distinction; as, a belted knight; a belted earl..

Inwheel :: Inwheel (v. t.) To encircle.

Sextant :: Sextant (n.) An instrument for measuring angular distances between objects, -- used esp. at sea, for ascertaining the latitude and longitude. It is constructed on the same optical principle as Hadley's quadrant, but usually of metal, with a nicer graduation, telescopic sight, and its arc the sixth, and sometimes the third, part of a circle. See Quadrant..

Entoprocta :: Entoprocta (n. pl.) A group of Bryozoa in which the anus is within the circle of tentacles. See Pedicellina.

Epicycloid :: Epicycloid (n.) A curve traced by a point in the circumference of a circle which rolls on the convex side of a fixed circle.

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..

Encyclopedian :: Encyclopedian (a.) Embracing the whole circle of learning, or a wide range of subjects..

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..

Circle :: Circle (n.) A form of argument in which two or more unproved statements are used to prove each other; inconclusive reasoning.

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..

Roulette :: Roulette (n.) A game of chance, in which a small ball is made to move round rapidly on a circle divided off into numbered red and black spaces, the one on which it stops indicating the result of a variety of wagers permitted by the game..

Semiannular :: Semiannular (a.) Having the figure of a half circle; forming a semicircle.

Lapwing :: Lapwing (n.) A small European bird of the Plover family (Vanellus cristatus, or V. vanellus). It has long and broad wings, and is noted for its rapid, irregular fight, upwards, downwards, and in circles. Its back is coppery or greenish bronze. Its eggs are the plover's eggs of the London market, esteemed a delicacy. It is called also peewit, dastard plover, and wype. The gray lapwing is the Squatarola cinerea..

Circulate :: Circulate (v. i.) To move in a circle or circuitously; to move round and return to the same point; as, the blood circulates in the body..

Corona :: Corona (n.) A crown or circlet suspended from the roof or vaulting of churches, to hold tapers lighted on solemn occasions. It is sometimes formed of double or triple circlets, arranged pyramidically. Called also corona lucis..

Clique :: Clique (v. i.) A narrow circle of persons associated by common interests or for the accomplishment of a common purpose; -- generally used in a bad sense.

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