ALL meanings of ordovician
Or·do·vi·cian
O o - adjective ordovician noting or pertaining to a geologic period of the Paleozoic Era, from 500 million to 425 million years ago, notable for the advent of fish. 1
- noun ordovician the Ordovician Period or System. 1
- adjective ordovician of, denoting, or formed in the second period of the Palaeozoic era, between the Cambrian and Silurian periods, which lasted for 45 000 000 years during which marine invertebrates flourished 0
- adjective ordovician designating or of the second geologic period of the Paleozoic Era, characterized by the development of abundant marine invertebrates and the first vertebrates 0