<p><strong>Adjective</strong></p><ul><li>Geology: Noting or pertaining to a period of the Paleozoic Era, occurring from 570 million to 500 million years ago, when algae and marine invertebrates were the predominant form of life.</li><li>Of or relating to Cambria; Welsh.</li></ul><p><strong>Noun</strong></p><ul><li>Geology: The Cambrian Period or System.</li><li>A native of Cambria; Welshman.</li></ul>