Sacellum
Pronunciation : Sa*cel"lum
Part of Speech : n.;
Etymology : [L., dim. of sacrum a sacred place.] (a) (Rom. Antiq.) An unroofed space consecrated to a divinity. (b) (Eccl.) A small monumental chapel in a church. Shipley.
Definition :
pl. Sacella.
Source : Webster's Unabridged Dictionary, 1913