A white brilliant matter which forms the interior of several shells.
The beautiful iridescent substance forming the inner covering of the shell of the pearl- mussel or oyster, called mother- of- pearl.
Mother- of- pearl. Also, nacker.
Belonging equally to more than one; as common to the human race; public; usual; frequent; inferior; of low birth or origin; in grammar, applied to both masculine and feminine gender, or to any individual of a class; as, a common noun. ...