I. sə̇ˈlu̇rēən, sīˈ- adjective
Usage: usually capitalized
Etymology: Latin Silur es + English -ian
1. : of or relating to the Silures or their place of habitation
2. : of or relating to the part of the Paleozoic era between the Ordovician and Devonian characterized by the flourishing of invertebrate marine life, the beginning of coral-reef building, and the appearance of some great crustaceans — see geologic time table
II. noun
( -s )
Usage: usually capitalized
1. : one of the Silures
2. : the Silurian period or system of rocks