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apsis noun

  /ˈæpsɪs/
  • (astronomy) Either of the points in the elliptical orbit of a planet, comet, or moon where it is closest or furthest from the body it orbits; examples are perihelion, aphelion, perigee, and apogee
 aipsis
  • (architecture) A recess or projection, with a dome or vault, at the east end of a church; an apse.
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