English definition of Comet

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Definition of comet

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Comet (n.) A member of the solar system which usually moves in an elongated orbit, approaching very near to the sun in its perihelion, and receding to a very great distance from it at its aphelion. A comet commonly consists of three parts: the nucleus, the envelope, or coma, and the tail; but one or more of these parts is frequently wanting. See Illustration in Appendix..

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Node :: Node (n.) One of the two points where the orbit of a planet, or comet, intersects the ecliptic, or the orbit of a satellite intersects the plane of the orbit of its primary..

Predict :: Predict (v. t.) To tell or declare beforehand; to foretell; to prophesy; to presage; as, to predict misfortune; to predict the return of a comet..

Thoracometer :: Thoracometer (n.) Same as Stethometer.

Velocity :: Velocity (n.) Quickness of motion; swiftness; speed; celerity; rapidity; as, the velocity of wind; the velocity of a planet or comet in its orbit or course; the velocity of a cannon ball; the velocity of light..

Planet :: Planet (n.) A celestial body which revolves about the sun in an orbit of a moderate degree of eccentricity. It is distinguished from a comet by the absence of a coma, and by having a less eccentric orbit. See Solar system..

Coma :: Coma (n.) The envelope of a comet; a nebulous covering, which surrounds the nucleus or body of a comet..

Comet :: Comet (n.) A member of the solar system which usually moves in an elongated orbit, approaching very near to the sun in its perihelion, and receding to a very great distance from it at its aphelion. A comet commonly consists of three parts: the nucleus, the envelope, or coma, and the tail; but one or more of these parts is frequently wanting. See Illustration in Appendix..

Oncometer :: Oncometer (n.) An instrument for measuring the variations in size of the internal organs of the body, as the kidney, spleen, etc..

Period :: Period (n.) A portion of time as limited and determined by some recurring phenomenon, as by the completion of a revolution of one of the heavenly bodies; a division of time, as a series of years, months, or days, in which something is completed, and ready to recommence and go on in the same order; as, the period of the sun, or the earth, or a comet..

Apomecometry :: Apomecometry (n.) The art of measuring the distance of objects afar off.

Nuclear :: Nuclear (a.) Of or pertaining to a nucleus; as, the nuclear spindle (see Illust. of Karyokinesis) or the nuclear fibrils of a cell; the nuclear part of a comet, etc..

Comet- Seeker :: Comet- seeker (n.) A telescope of low power, having a large field of view, used for finding comets..

Apomecometer :: Apomecometer (n.) An instrument for measuring the height of objects.

Star :: Star (n.) One of the innumerable luminous bodies seen in the heavens; any heavenly body other than the sun, moon, comets, and nebulae..

Track :: Track (n.) Course; way; as, the track of a comet..

Envelop :: Envelop (n.) The nebulous covering of the head or nucleus of a comet; -- called also coma.

Perigeum :: Perigeum (n.) That point in the orbit of the moon which is nearest to the earth; -- opposed to apogee. It is sometimes, but rarely, used of the nearest points of other orbits, as of a comet, a planet, etc. Called also epigee, epigeum..

Epoch :: Epoch (n.) The date at which a planet or comet has a longitude or position.

Cometarium :: Cometarium (n.) An instrument, intended to represent the revolution of a comet round the sun..

Nucleus :: Nucleus (n.) The body or the head of a comet.