Ordovician
adjective, proper noun
- adjective (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 (geology) The Ordovician period.
Synonyms
Etymology
From Ordovices + -ian. Coined by English geologist Charles Lapworth in 1879 after the Celtic tribe of the Ordovices.
Webster’s 1913
- adjective Of or pertaining to a division of the Silurian formation, corresponding in general to the Lower Silurian of most authors, exclusive of the Cambrian.
- adjective The Ordovician formation.
Etymology [From L. Ordovices, a Celtic people in Wales.]
Sources: Wiktionary · WordNet 3.0 · Webster’s 1913 — from the Wiktionary entry “Ordovician”, CC BY-SA 4.0. Details