Definition of silurian :
1. Of or pertaining to the country of the ancient Silures; - a term applied to the earliest of the Paleozoic eras, and also to the strata of the era, because most plainly developed in that country.
2. The age.
- Cystideae of Silurian rocks. - "The Student's Elements of Geology", Sir Charles Lyell.
- I certainly caught a glimpse of him half an hour ago; but before I could escape from a geologist who was boring me about the Silurian system, Kenelm had vanished. - "Kenelm Chillingly, Complete", Edward Bulwer-Lytton.
- Hence there might still have been hope for the fourfold order, were it not that the fates unkindly determined that scorpions-" creeping things that creep on the earth" par excellence- turned up in Silurian strata nearly at the same time. - "The Interpreters of Genesis and the Interpreters of Nature Essay #4 from "Science and Hebrew Tradition"", Thomas Henry Huxley.