Pronunciation: (si-loor'ē-un, sī-), [key]
1. of or pertaining to the Silures or their country.
2. Geol.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. See table under geologic time.
Geol.the Silurian Period or System of rocks.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.