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1. (n.) perihelion
the point in the orbit of a planet or comet at which it is nearest to the sun.
Etymology: (1895–1900; peri - + Gk káryon nut, kernel)
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| Definition of 'perihelion' |
Princeton's WordNet |
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1. (noun) perihelion
periapsis in solar orbit; the point in the orbit of a planet or comet where it is nearest to the sun
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| Definition of 'perihelion' |
Webster Dictionary |
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1. (noun) perihelion
alt. of Perihelium
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| Definitions of 'perihelion' |
The Nuttall Encyclopedia |
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1. perihelion
the point on the orbit of a planet or comet nearest the sun.
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Definitions of perihelion 
