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sacellum

noun
sa·​cel·​lum | \səˈkeləm, səˈse-\
plural sacella\-​lə \

Definition of sacellum 

1 : a small monumental chapel in a church

2 : an unroofed space in an ancient Roman building consecrated to a divinity

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History and Etymology for sacellum

Latin, pagan Roman sacellum, diminutive of sacrum sanctuary, sacred object, from neuter of sacer sacred

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