Definition:
silurian
- silurianformed in the third period of the Palaeozoic era
- silurianthe Silurian Period or System of rocks
- silurianof or pertaining to the Silures or their country
- siluriannoting 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