Ordovician

[ awr-duh-vish-uhn ]

/ ˌɔr dəˈvɪʃ ən /

Geology

adjective

noting or pertaining to a geologic period of the Paleozoic Era, from 500 million to 425 million years ago, notable for the advent of fish.

noun

the Ordovician Period or System.

Origin of Ordovician

1879; after the Ordovices (plural) (<Latin ) an ancient British tribe in N Wales, where rocks characterizing the period were found; see -ian

OTHER WORDS FROM Ordovician

post-Or·do·vi·cian, adjective

Words nearby Ordovician

Ordnance Survey, ordo, Ordóñez, ordonnance, Ordos, Ordovician, ordure, Ordzhonikidze, ore, oread, orebody

Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for Ordovician

They were more than likely the undisputed masters of the Ordovician seas.
Geology|William J. Miller
The Silurian strata are mostly found in the same localities as those which furnish exposures of the rocks of Ordovician age.
The Principles of Stratigraphical Geology|J. E. Marr
It consists essentially of an island of Ordovician (Lower Silurian) limestone, surrounded by the later systems.
Early Western Travels 1748-1846, Volume XIV|Edwin James
That it was not, however, entirely a mud groveller is indicated by its widespread distribution in middle Ordovician times.
The Appendages, Anatomy, and Relationships of Trilobites|Percy Edward Raymond

The characters of the Ordovician trilobites have already been noticed.
The Principles of Stratigraphical Geology|J. E. Marr

British Dictionary definitions for Ordovician

Ordovician

/ (ˌɔːdəʊˈvɪʃɪən) /

adjective

of, denoting, or formed in the second period of the Palaeozoic era, between the Cambrian and Silurian periods, which lasted for 45 000 000 years during which marine invertebrates flourished

noun

the Ordovician the Ordovician period or rock system

Word Origin for Ordovician

C19: from Latin Ordovices ancient Celtic tribe in N Wales

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for Ordovician

Ordovician

[ ôr′də-vĭsh′ən ]

The second period of the Paleozoic Era, from about 505 to 438 million years ago. During this time most of the Earth's landmasses were gathered in the supercontinent Gondwanaland, located in the Southern Hemisphere. Much of this continent was submerged under shallow seas, and marine invertebrates, including trilobites, brachiopods, graptolites, and conodonts were widespread. The first primitive fishes appeared; some evidence suggests the first land plants may also have appeared at this time. By the end of the Ordovician massive glaciers formed on Gondwanaland, causing sea levels to drop and approximately 60 percent of all known marine invertebrates to become extinct. See Chart at geologic time.

单词	ordovician
释义	Ordovician [ awr-duh-vish-uhn ] / ˌɔr dəˈvɪʃ ən / Geology adjective noting or pertaining to a geologic period of the Paleozoic Era, from 500 million to 425 million years ago, notable for the advent of fish. noun the Ordovician Period or System. Origin of Ordovician 1879; after the Ordovices (plural) (<Latin ) an ancient British tribe in N Wales, where rocks characterizing the period were found; see -ian OTHER WORDS FROM Ordovician post-Or·do·vi·cian, adjective Words nearby Ordovician Ordnance Survey, ordo, Ordóñez, ordonnance, Ordos, Ordovician, ordure, Ordzhonikidze, ore, oread, orebody Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 Example sentences from the Web for Ordovician They were more than likely the undisputed masters of the Ordovician seas. Geology\|William J. Miller The Silurian strata are mostly found in the same localities as those which furnish exposures of the rocks of Ordovician age. The Principles of Stratigraphical Geology\|J. E. Marr It consists essentially of an island of Ordovician (Lower Silurian) limestone, surrounded by the later systems. Early Western Travels 1748-1846, Volume XIV\|Edwin James That it was not, however, entirely a mud groveller is indicated by its widespread distribution in middle Ordovician times. The Appendages, Anatomy, and Relationships of Trilobites\|Percy Edward Raymond The characters of the Ordovician trilobites have already been noticed. The Principles of Stratigraphical Geology\|J. E. Marr British Dictionary definitions for Ordovician Ordovician / (ˌɔːdəʊˈvɪʃɪən) / adjective of, denoting, or formed in the second period of the Palaeozoic era, between the Cambrian and Silurian periods, which lasted for 45 000 000 years during which marine invertebrates flourished noun the Ordovician the Ordovician period or rock system Word Origin for Ordovician C19: from Latin Ordovices ancient Celtic tribe in N Wales Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012 Scientific definitions for Ordovician Ordovician [ ôr′də-vĭsh′ən ] The second period of the Paleozoic Era, from about 505 to 438 million years ago. During this time most of the Earth's landmasses were gathered in the supercontinent Gondwanaland, located in the Southern Hemisphere. Much of this continent was submerged under shallow seas, and marine invertebrates, including trilobites, brachiopods, graptolites, and conodonts were widespread. The first primitive fishes appeared; some evidence suggests the first land plants may also have appeared at this time. By the end of the Ordovician massive glaciers formed on Gondwanaland, causing sea levels to drop and approximately 60 percent of all known marine invertebrates to become extinct. See Chart at geologic time. The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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