sanctum /sangkˈtəm/

1. (esp in the phrase inner sanctum) a sacred place
2. A (very) private room

sanctum sanctorum noun

1. The holy of holies, the inner chamber of the Jewish tabernacle
2. Any specially reserved retreat or room (informal)

• ribibes
• ribible
• ribibles
• ribless
• riblet
• riblets
• riblike
• riboflavin
• riboflavine
• riboflavins
• ribonuclease
• ribonucleases
• ribonucleic acids
• ribonucleotide
• ribonucleotides
• ribose
• riboses
• ribosomal
• ribosomal RNA
• ribosome
• ribosomes
• ribozyme
• ribozymes
• rib-plough
• rib-roast