#apse__apsis__apsi  a domed or vaulted recess or projection on a building especially the east end of a church; usually contains the the altar
  supertype:  recess__niche  an enclosure that is set back or indented
  part of:  church_building
  subtype:  tribune  the apse of a Christian church that contains the bishop's throne

No statement uses or specializes apse; click here to add one.