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1. Oxford American Dictionary

   apsis

   • IPA[ˈapsəs]

   美式

   • n.
     either of two points on the orbit of a planet or satellite that are nearest to or furthest from the body around which it moves.

   • noun: apsis, plural noun: apsides

2. • 更多解釋

   apsis

   • IPA[ˈapsɪs]

   英式

   • n.
     either of two points on the orbit of a planet or satellite that are nearest to or furthest from ...

   Oxford Dictionary