Main Entry: Or·do·vi·cian

Pronunciation: \ˌȯr-də-ˈvi-shən\

Function: adjective

Etymology: Latin Ordovices, ancient people in northern Wales

Date: 1879

: of, relating to, or being the period between the Cambrian and the Silurian or the corresponding system of rocks — see geologic time table

— Ordovician noun