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

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

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

Glaucometer :: Glaucometer (n.) See Gleucometer.

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..

Cometic :: Cometic (a.) Relating to a comet.

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

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

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

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

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

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

Cometary :: Cometary (a.) Pertaining to, or resembling, a comet..

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..

Oncograph :: Oncograph (n.) An instrument for registering the changes observable with an oncometer.

Maranatha :: Maranatha (n.) Our Lord cometh; -- an expression used by St. Paul at the conclusion of his first Epistle to the Corinthians (xvi. 22). This word has been used in anathematizing persons for great crimes; as much as to say, May the Lord come quickly to take vengeance of thy crimes. See Anathema maranatha, under Anathema..

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..

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..

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..

Cometographer :: Cometographer (n.) One who describes or writes about comets.