An apsidole or absidiale is a small or secondary apse

Apse

In architecture, the apse is a semicircular recess covered with a hemispherical vault or semi-dome...

, 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.

Francis Bond says that the Norman

Norman architecture

About|Romanesque architecture, primarily English|other buildings in Normandy|Architecture of Normandy.File:Durham Cathedral. Nave by James Valentine c.1890.jpg|thumb|200px|The nave of Durham Cathedral demonstrates the characteristic round arched style, though use of shallow pointed arches above the...

 plan of eastern limb, which the Norman builders brought over to England at the Conquest, contained a central apse flanked by apsidioles.