cul-de-four

noun
\¦kəldə̇¦fu̇(ə)r also ¦ku̇l-, F kᵫ̅dfüür\
plural culs-de-four\ " \

Definition of cul-de-four 

1 : a vault shaped like a quarter sphere or like a hemisphere

2 : vault — compare semidome

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History and Etymology for cul-de-four

French, literally, bottom of an oven

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