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
Origin and Etymology of silurian
First Known Use: 1708
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