calotte

[kuh-lot] /kəˈlɒt/
noun
1.
zucchetto.
2.
skullcap (def 1).
Origin
1625-35; < French, Middle French: skullcap, perhaps equivalent to Old French cale ribbon for the hair, kind of hat (perhaps from escale shell (see scale1) taken as a deverbal form with es- ex1) + -otte diminutive suffix
British Dictionary definitions for calotte

calotte

/kəˈlɒt/
noun
1.
a skullcap worn by Roman Catholic clergy
2.
(architect) a concavity in the form of a niche or cup, serving to reduce the apparent height of an alcove or chapel
Word Origin
C17: from French, from Provençal calota, perhaps from Greek kaluptra hood