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We found 2 dictionaries that define the word Tonian:

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

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Definitions from Wiktionary (Tonian)

▸ adjective:  (geology) Of a geologic period within the Neoproterozoic era from about 1000 to 850 million years ago.
▸ noun:  (geology) The Tonian period.

Similar:
Neoproterozoic, Stennian, Cryogenian, Paleoproterozoic, Proterozoic, Mesoproterozoic, Siderian, Cambrian, Ectasian, Ediacaran, more...

Opposite:
atonian, untuneful, discordant

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Similar:
Neoproterozoic, Stennian, Cryogenian, Paleoproterozoic, Proterozoic, Mesoproterozoic, Siderian, Cambrian, Ectasian, Ediacaran, more...

Opposite:
atonian, untuneful, discordant



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