One of the mysteries of the English language finally explained.
Of or relating to the extinct superfamily Pentameroidea or family Pentameridae of articulate brachiopods having roughly pentagonal shells, known from fossils of Ordovician to Devonian age.
A pentameroid brachiopod.
Late 19th century; earliest use found in American Cyclopedia. From scientific Latin Pentamerus + -oid.
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