Adjective
Of or pertaining to the apsides of an orbit.
Of or pertaining to the apse of a church; as, the apsidal termination of the chancel.
Source: Webster's dictionaryIt is a Latin Cross with a comparatively long nave and short transepts and eastern end, which is apsidal. Source: Internet
The apsidal east end was often a focus of decoration, with both architectonic forms such as arcading and pictorial features such as carved figures, murals and occasionally mosaics. Source: Internet
Later Romanesque chapter houses sometimes had an apsidal eastern end. Source: Internet