apsidiole
noun
ap·sid·i·ole
apˈsidēˌōl
variants or less commonly absidiole
abˈs-
plural -s
: a small apse
specifically : one of the smaller or secondary apses in a church having several apses
Word History
Etymology
French absidiole, from abside apse (from Medieval Latin absid-, absis) + -i- + -ole