periostracum /per-i-osˈtrə-kəm/

The horny outer layer of a mollusc's shell

• bariatric
• bariatrics
• baric
• barilla
• barillas
• baring
• bar-iron
• bar-irons
• barish
• barista
• baristas
• barite
• barites
• baritone
• baritones
• barium
• barium meal
• bariums
• bark
• barkan
• barkans
• bark-bed
• bark-beds
• bark-beetle
• bark-beetles