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Meaning of sacellum

sa•cel•lum

Pronunciation: (su-kel'um, -sel'-), [key]
— pl. -cel•la
  1. a small chapel, as a monument within a church.
  2. (in ancient Rome) a shrine open to the sky.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.