periostracum /per-i-osˈtrə-kəm/

The horny outer layer of a mollusc's shell

• self-executing
• self-exertion
• self-exertions
• self-exiled
• self-existence
• self-existent
• self-explaining
• self-explanatory
• self-explication
• self-express
• self-expressed
• self-expresses
• self-expressing
• self-expression
• self-expressive
• self-faced
• self-fed
• self-feeder
• self-feeders
• self-feeding
• self-feeling
• self-fertile
• self-fertilisation
• self-fertility
• self-fertilization