A small semicircular or polygonal recess, typically found in a church or basilica, often serving as a chapel or altar space.
From Late Latin apsidiola, the diminutive form of apsis (a semicircular recess), which derives from Greek apsis meaning 'arch' or 'vault.' The -ole suffix indicates a smaller version of the main structure.
Medieval churches used apsidioles as side chapels where pilgrims could pray at lesser altars—they're like the architectural equivalent of having multiple prayer lanes in a spiritual highway.
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