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Explanation: Two references at the site below, both confirming Maureen's, with the alternative of "radiating apse", specifying:
Radiating apses: chapels around sides of transept for lots of altars to house relics which were pilgrimage spots.
The period is Romanesque, so sounds good.
Apologies for the truncated 'agree' earlier, I was pasting in the quotation but... David