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We found 2 dictionaries that define the word siderian:

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

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Definitions from Wiktionary (Siderian)

▸ adjective:  (geology) Of a geologic period within the Paleoproterozoic era from about 2500 to 2300 million years ago.
▸ noun:  (geology) The Siderian period.

Similar:
Stennian, Orosirian, Statherian, Mesoproterozoic, Rhyacian, Smithian, Paleoproterozoic, Tonian, Neoproterozoic, Ectasian, more...

Opposite:
prolunar, antelucan, postlunar

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Similar:
Stennian, Orosirian, Statherian, Mesoproterozoic, Rhyacian, Smithian, Paleoproterozoic, Tonian, Neoproterozoic, Ectasian, more...

Opposite:
prolunar, antelucan, postlunar



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