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  1. Noun.  (architecture) A semicircular projection from a building, especially the rounded east end of a church that contains the altar.
  2. Noun.  (astronomy, obsolete) The nearest and furthest points to the centre of gravitational attraction for a body in orbit. More usually called an apsis.
  3. Noun.  (obsolete, or) In some local dialects and in archaic usage, an aspen tree.

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This entry was last updated on RefTopia from its source on 3/20/2012.