pentamerus

CIDE DICTIONARY

pentamerus, n. [NL. See Pentamerous.].

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.

For further exploring for "pentamerus" in Webster Dictionary Online

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