Definition of apse noun from the Oxford Advanced Learner's Dictionary

 

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 noun
noun
BrE BrE//æps//
 
; NAmE NAmE//æps//
 
Religious buildings
 
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a small area in a church, often in the shape of a semicircle and usually at the east end of the building See related entries: Religious buildings Word Origin early 19th cent. (in the sense of an orbit of a planet): via Latin from Greek apsis, hapsis ‘arch, vault’, perhaps from haptein ‘fasten, join’.
See the Oxford Advanced American Dictionary entry: apse