periostracum Definition
a thin organic coating or film on the surface of the shells of mollusks and some other invertebrates.
Using periostracum: Examples
Take a moment to familiarize yourself with how "periostracum" can be used in various situations through the following examples!
Example
The periostracum is often lost from fossil shells.
Example
The periostracum of the shell is composed of a protein called conchiolin.
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Summary: periostracum in Brief
'Periostracum' [ˌpɛrɪˈɒstrəkəm] is a noun that refers to a thin organic coating or film on the surface of the shells of mollusks and some other invertebrates. It is often lost from fossil shells and is composed of a protein called conchiolin.
