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| per·i·he·li·on [ pèrrə hlyən, pèrrə hlee ən, pérrə heelee ən ] (plural per·i·he·li·a [ pèrrə hlee ə ]) |
noun |
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| Definition: |
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point in orbit nearest to Sun: the point in the orbit of a planet or other astronomical body at which it comes closest to the Sun
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| [Mid-17th century. Alteration of modern Latin perihelium< Greek peri "around" + hēlios "sun"] |
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 per·i·he·li·al adjective |
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