[Si.lu.ri.an] adj [L Silures] (1708) 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 -- Silurian n