• Tonian

    Full definition of Tonian

    Adjective

    Tonian

    1. (geology) Of a geologic period within the Neoproterozoic era from about 1000 to 850 million years ago.

    Noun

    Tonian

    (uncountable)
    1. (geology) The Tonian period.

    Anagrams

    © Wiktionary