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We found 2 dictionaries that define the word Orosirian:

General (2 matching dictionaries)
  1. Orosirian: Wiktionary
  2. Orosirian: Wikipedia, the Free Encyclopedia

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Definitions from Wiktionary (Orosirian)

▸ adjective:  (geology) Of a geologic period within the Paleoproterozoic era from about 2050 to 1800 million years ago.
▸ noun:  (geology) The Orosirian period.

Similar:
Paleoproterozoic, Ordovician, Siderian, Rhyacian, Proterozoic, Ordovian, Neoproterozoic, Orleanian, Paleogene, Ectasian, more...

Opposite:
post-Orosirian, non-Orosirian.

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Similar:
Paleoproterozoic, Ordovician, Siderian, Rhyacian, Proterozoic, Ordovian, Neoproterozoic, Orleanian, Paleogene, Ectasian, more...

Opposite:
post-Orosirian, non-Orosirian.



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