A semicircular or polygonal recess in a building, especially at the end of a church choir or altar area.
From Latin 'apsis,' derived from Greek 'hapsis' meaning 'arch' or 'vault.' The word entered architectural terminology in medieval Latin to describe the rounded extensions in basilicas and churches.
Many of the world's most iconic churches—from Hagia Sophia to medieval cathedrals—feature apses that were designed not just for beauty but for acoustic perfection, making the priest's voice carry throughout the building like a natural amplifier.
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