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Webster 1913 Edition
Pentamerus
‖
Pen-tam′e-rus
,Noun.
[NL. See
Pentamerous
.] (Paleon.)
A genus of extinct Paleozoic brachiopods, often very abundant in the Upper Silurian.
Pentamerus limestone
(Geol.)
, a Silurian limestone composed largely of the shells of Pentamerus.