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apsidiole

noun ap·sid·i·ole \ apˈsidēˌōl \
variants: or less commonly absidiole \abˈs-\
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Definition of apsidiole

plural -s
: a small apse; specifically : one of the smaller or secondary apses in a church having several apses

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Origin and Etymology of apsidiole

French absidiole, from abside apse (from Medieval Latin absid-, absis) + -i- + -ole

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