Definition of Silurian
1
: of or relating to the Silures or their place of habitation
2
: of, relating to, or being a period of the Paleozoic era between the Ordovician and Devonian or the corresponding system of rocks marked by numerous eurypterid crustaceans and the appearance of the first land plants — see Geologic Time Table
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Merriam-Webster unabridged
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The first known use of Silurian was in 1708
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