periostracum /per-i-osˈtrə-kəm/

The horny outer layer of a mollusc's shell

• casement window
• casement windows
• casemix
• casemixes
• case of conscience
• caseous
• casern
• caserne
• casernes
• caserns
• cases
• case-sensitive
• case-shot
• case-shots
• case-studies
• case-study
• casevac
• casevaced
• casevacing
• casevacked
• casevacking
• casevacs
• casework
• caseworker
• caseworkers