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.
- Poole, Thomas Henry (1907). "Apsidiole". In Herbermann, Charles. Catholic Encyclopedia. 1. New York: Robert Appleton Company.
- Bond, Francis (1912) . Gothic architecture in England : an analysis of the origin & development of English church architecture from the Norman conquest to the dissolution of the monasteries. London: Batsford. p. 163. OCLC 2937528.