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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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..

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

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..

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

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

Stethoscope :: Stethometer (n.) An apparatus for measuring the external movements of a given point of the chest wall, during respiration; -- also called thoracometer..

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

Perihelium :: Perihelium (n.) That point of the orbit of a planet or comet which is nearest to the sun; -- opposed to aphelion.

Anthracometer :: Anthracometer (n.) An instrument for measuring the amount of carbonic acid in a mixture.

Trajectory :: Trajectory (n.) The curve which a body describes in space, as a planet or comet in its orbit, or stone thrown upward obliquely in the air..

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..

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

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

Aphelion :: Aphelion (n.) That point of a planet's or comet's orbit which is most distant from the sun, the opposite point being the perihelion..

Cometology :: Cometology (n.) The department of astronomy relating to comets.

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

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

Anthracometric :: Anthracometric (a.) Of or pertaining to an anthracometer.

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

Radius Vector :: Radius vector (n.) An ideal straight line joining the center of an attracting body with that of a body describing an orbit around it, as a line joining the sun and a planet or comet, or a planet and its satellite..