Periastron

1 definition found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Periastron \Per`i*as"tron\, n. [NL., fr. Gr. peri` about +
     'a`stron a star.] (Astron.)
     That point, in the real or apparent orbit of one star
     revolving around another, at which the former is nearest to
     the latter.
     [1913 Webster]