Having a chapel or equipped with a chapel; provided with one or more chapels.
From chapel plus the suffix -ed, which creates adjectives meaning 'having' or 'furnished with' (as in 'talented' or 'armed').
The -ed suffix can work as an adjective to mean 'having' something—a 'long-haired person' has long hair, and a 'chapelled building' has a chapel, showing how one suffix does double duty.
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