apse /ˈæps/
  教堂半圓形的後殿
  Apse n.; pl. Apses [See Apsis.]
  1. Arch. (a) A projecting part of a building, esp. of a church, having in the plan a polygonal or semicircular termination, and, most often, projecting from the east end. In early churches the Eastern apse was occupied by seats for the bishop and clergy.   Hence: (b) The bishop's seat or throne, in ancient churches.
  2. A reliquary, or case in which the relics of saints were kept.
  Note: ☞ This word is also written apsis and absis.
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  apse
       n : a domed or vaulted recess or projection on a building
           especially the east end of a church; usually contains the
           altar [syn: apsis]