Plural of chapel; multiple small church buildings or prayer rooms, often attached to larger structures.
From chapel (Old French chapele, from Late Latin cappella, originally 'the cloak of Saint Martin') pluralized with -s.
The word chapel traces back to Saint Martin's cloak kept as a holy relic in a small shrine—reliquaries became so important that whole buildings grew around them, and the building took the name of the relic-holder!
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