Apse - What does it mean?
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(architecture) A semicircular projection from a building, especially the rounded east end of a church that contains the altar.
The bishop's seat or throne in ancient churches.
A reliquary, or case in which the relics of saints were kept.
(astronomy, obsolete) The nearest and furthest points to the centre of gravitational attraction for a body in orbit. More usually called an apsis.
(obsolete, or, dialectal) An aspen tree.
The difference between apse and is: