Etymology
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apse (n.)

"semicircular extension at the end of a church," 1846, from Latin apsis "an arch, a vault," from Greek hapsis (Ionic apsis) "loop, arch," originally "a fastening, felloe of a wheel," from haptein "fasten together," which is of unknown origin. The original sense in Greek seems to have been the joining of the arcs to form a circle, especially in making a wheel. The architectural term is earlier attested in English in the Latin form (1706). Related: Apsidal.

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Definitions of apse

apse (n.)
a domed or vaulted recess or projection on a building especially the east end of a church; usually contains the altar;
Synonyms: apsis
From wordnet.princeton.edu