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

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

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

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.

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

Comet-finder :: Comet-finder (n.) Alt. of Comet- seeke.

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

Glaucometer :: Glaucometer (n.) See Gleucometer.

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..

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..

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..

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

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

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

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

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..

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