Skip to definition.
Get the FREE one-click dictionary software for Windows or the iPhone/iPad and Android apps

Noun: Ordovician  ,or-du'vi-sh(ee-)un or ,or-du'vi-see-un
  1. The period from 500 million to 425 million years ago; characterized by conodonts and ostracods and algae and seaweeds
    - Ordovician period

Type of: geological period, period

Part of: Palaeozoic [Brit, Cdn], Paleozoic, Paleozoic era

Encyclopedia: Ordovician