<p><strong>Adjective:</strong></p><ul><li>Of or relating to the Silures or their country.</li><li>Geology. Noting or pertaining to a period of the Paleozoic Era, occurring from 425 to 405 million years ago, notable for the advent of air-breathing animals and terrestrial plants.</li></ul><p><strong>Noun:</strong></p><ul><li>Geology. The Silurian Period or System of rocks.</li></ul>