Ordovician

Definition:

• (a.) Of or pertaining to a division of the Silurian formation, corresponding in general to the Lower Silurian of most authors, exclusive of the Cambrian.
• (n.) The Ordovician formation.

Compare ordovician with other words:

epoch vs. ordovician

era vs. ordovician

ordovician vs. period

geologic vs. ordovician

ordovician vs. paleozoic