Ordovician

== English == === Etymology === From Ordovices +‎ -ian. Coined by English geologist Charles Lapworth in 1879 after the Celtic tribe of the Ordovices. === Adjective === Ordovician (comparative more Ordovician, superlative most Ordovician) (geology) Of a geologic period within the Paleozoic era; comprises lower, middle and upper epochs from about 488 to 443 million years ago. === Proper noun === Ordovician (geology) The Ordovician period. ==== Translations ==== === See also === Appendix:Geologic timescale