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/æps/noun
Elementary
1
The rounded east end of a church that contains or is behind the altar.
2
The interior portion of this section of the church building, excluding the ambulatory and any apse chapels.
3
A semicircular projection from any building that is similar to a church's apse.
4
The bishop's seat or throne in ancient churches.
5
A reliquary: a case in which the relics of saints are kept.
6
Obsolete form of apsis (“the nearest and furthest points to the centre of gravitational attraction for a body in orbit”).
Thesaurus
#obsolete