Definition of Ordovician in English:

Ordovician

adjective

Geology
  • 1Relating to or denoting the second period of the Paleozoic era, between the Cambrian and Silurian periods.

    • ‘In contrast, the Ordovician magmatic event postdates the pre-Variscan deformation in the external zone.’
    • ‘They interpreted these dates to represent an Ordovician regional metamorphic event.’
    • ‘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.’
    • ‘Additional indications for a potential tectonic boundary in Hinnoy are provided by local evidence of an Ordovician event in basement units of the Lofoten area.’
    1. 1.1The Ordovician period or the system of rocks deposited during it.

Origin

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

Pronunciation:

Ordovician

/ˌôrdəˈviSHən/