Ordovician period

Ordovician period
from 500 million to 425 million years ago; conodonts and ostracods and algae and seaweeds
Syn: ↑Ordovician
Instance Hypernyms: ↑period, ↑geological period
Part Holonyms: ↑Paleozoic, ↑Paleozoic era

Useful english dictionary. 2012.

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  • Ordovician Period — Interval of geologic time, 490–443 million years ago, the second oldest period of the Paleozoic Era. It follows the Cambrian and precedes the Silurian. During the Ordovician, many of the landmasses were aligned in the tropics. Life was dominated… …   Universalium

  • Ordovician — Period 488.3–443.7 million years ago …   Wikipedia

  • Ordovician — [ôr΄də vish′ən] adj. [< L Ordovices, ancient Celtic tribe in Wales] [sometimes o ] designating or of the second geologic period of the Paleozoic Era, characterized by the development of abundant marine invertebrates and the first vertebrates… …   English World dictionary

  • Ordovician radiation — The Ordovician radiation was the diversification of animal life at the start of the Ordovician period, just 40 million years after the Cambrian explosion.It followed a series of extinction events at the Cambrian Ordovician boundary, and the… …   Wikipedia

  • Ordovician — /awr deuh vish euhn/, Geol. adj. 1. 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. See table at GEOLOGIC TIME. n. 2. the Ordovician Period or System.… …   Universalium

  • period — /pear ee euhd/, n. 1. a rather large interval of time that is meaningful in the life of a person, in history, etc., because of its particular characteristics: a period of illness; a period of great profitability for a company; a period of social… …   Universalium

  • Ordovician — 1. adjective Of a geologic period within the Paleozoic era; comprises lower, middle and upper epochs from about 488 to 443 million years ago. 2. noun The Ordovician period …   Wiktionary

  • Ordovician — Or•do•vi•cian [[t]ˌɔr dəˈvɪʃ ən[/t]] adj. 1) gel 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 2) gel the Ordovician Period or System • Etymology: 1879;… …   From formal English to slang

  • Ordovician — (adj.) geological period following the Cambrian and preceding the Silurian, 1879, coined by English geologist Charles Lapworth (1842 1920) from L. Ordovices, name of an ancient British tribe in North Wales. The period so called because rocks from …   Etymology dictionary

  • Ordovician — ► ADJECTIVE Geology ▪ relating to the second period of the Palaeozoic era (between the Cambrian and Silurian periods), about 510 to 439 million years ago, a time when the first vertebrates appeared. ORIGIN from Ordovices, the Latin name of an… …   English terms dictionary

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