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comparative more Silurian, superlative most Silurian
(geology) Of a geologic period within the Paleozoic era; comprises the Llandovery, Wenlock, Ludlow and Pridoli epochs from about 439 to 409 million years ago. quotations
In some places, however, quartz reefs, payably auriferous while in Silurian rock, have been followed down to subjacent granite, and have there been found to thin out and become unprofitable […]
1887, R. A. Murray, Victoria. Geology and Physical Geography, page 126
(archaeology) Of or related to the Silures, a pre-Roman British tribe.
plural Silurians
A member of the Silures, an ancient tribe of Britannia. examples
(geology) The Silurian period.