Definition of “apse”
noun:
-
A semicircular projection from a building, especially the rounded east end of a church that contains the altar.
from Wiktionary, Creative Commons Attribution/Share-Alike License -
The bishop's seat or throne in ancient churches.
from Wiktionary, Creative Commons Attribution/Share-Alike License -
A reliquary, or case in which the relics of saints were kept.
from Wiktionary, Creative Commons Attribution/Share-Alike License -
The nearest and furthest points to the centre of gravitational attraction for a body in orbit. More usually called an apsis.
from Wiktionary, Creative Commons Attribution/Share-Alike License
-