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The Collaborative International Dictionary of English v.0.48 (gcide)

Apse \Apse\ ([a^]ps), n.; pl. Apses ([a^]p"s[e^]z). [See
{Apsis}.]
1. (Arch.)
(a) A projecting part of a building, esp. of a church,
having in the plan a polygonal or semicircular
termination, and, most often, projecting from the east
end. In early churches the Eastern apse was occupied
by seats for the bishop and clergy. Hence:
(b) The bishop's seat or throne, in ancient churches.
[1913 Webster]

2. A reliquary, or case in which the relics of saints were
kept.
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Note: This word is also written {apsis} and {absis}.
[1913 Webster]