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The American Church Dictionary and Cycopedia
An architectural term descriptive of the semicircular or polygonal shape in which the Chancel is frequently built. From a Greek word meaning a joining; also a bow, an arch, a vault.
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Miller, William James. Entry for 'Apse'. The American Church Dictionary and Cyclopedia. https://www.studylight.org/dictionaries/eng/acd/a/apse.html. 1901.