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periastron
noun
peri·as·tron
\¦perē¦astrən, -ˌsträn\
Definition of periastron
periastra
\-strə\: the point in the orbit of a star or other celestial body where it is nearest to the primary star with reference to which it is revolving the periastron of a comet — compare apastron
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Origin and Etymology of periastron
New Latin, from peri- + Greek astron star
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