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| per·i·as·tron [ pèrree ástrən, pèrree á stròn ] (plural per·i·as·trons) |
noun |
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| Definition: |
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points when stars are nearest: the points in space and time in the orbits of two stars in a binary system at which they are closest together
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| [Mid-19th century. <peri- + Greek astron "star," after perihelion] |
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