pleromorph
/ˈplɪərəmɔːf/Mineralogy rare
noun
A type of pseudomorph produced by the deposition of a mineral substance so as to fill a cavity left in a rock by the removal of a crystal of another mineral substance.
Origin
Late 19th century; earliest use found in American Naturalist. From Hellenistic Greek πληρο- + -morph, after French †pléromorphose, itself after German Pleromorphose.