An apsidole or absidiale is a small or secondary apse, one of the apses on either side of the main apse in a triapsidal church, or one of the apse-chapels when they project on the exterior of the church, particularly if the projection resembles an apse in shape.[1]
Francis Bond[2] says that the Norman plan of eastern limb, which the Norman builders brought over to England at the Conquest, contained a central apse flanked by apsidioles.
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References
This article incorporates text from a publication now in the public domain: Poole, Thomas Henry (1907). "Apsidiole". In Herbermann, Charles (ed.). Catholic Encyclopedia. Vol. 1. New York: Robert Appleton Company.