'Pentamerus' definitions:
Definition of 'Pentamerus'
From: GCIDE
- Pentamerus \Pen*tam"e*rus\, n. [NL. See Pentamerous.] (Paleon.) A genus of extinct Paleozoic brachiopods, often very abundant in the Upper Silurian. [1913 Webster]
- Pentamerus limestone (Geol.), a Silurian limestone composed largely of the shells of Pentamerus. [1913 Webster]