<p><strong>Adjective</strong></p><ul><li>noting or pertaining to a period of the Paleozoic Era, including the Pennsylvanian and Mississippian periods as epochs, occurring from 345 million to 280 million years ago</li><li>producing carbon or coal</li></ul><p><strong>Noun</strong></p><ul><li>the Carboniferous Period or System</li></ul>