Definition of Ordovician in English:

Ordovician

Syllabification: Or·do·vi·cian
Pronunciation: /ˌôrdəˈviSHən
 
/

adjective

Geology
1Of, relating to, or denoting the second period of the Paleozoic era, between the Cambrian and Silurian periods.
More example sentences
  • These are overlain by low-grade metamorphosed sediments and volcanics of Ordovician and Silurian age.
  • Because of the disparate nature of the Ordovician and Cambrian records, it is difficult to make direct comparison between the two events.
  • In contrast, the Ordovician magmatic event postdates the pre-Variscan deformation in the external zone.
1.1 (as noun the Ordovician) The Ordovician period or the system of rocks deposited during it.

The Ordovician lasted from about 510 million to 439 million years ago. It saw the diversification of many invertebrate groups and the appearance of the first vertebrates (jawless fish)

Origin

late 19th century: from Ordovices, the Latin name of an ancient British tribe in North Wales, + -ian.

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