Tonian.
Of a geologic period within the Neoproterozoic era from about 1000 to 850 million years ago.
Meaning & usage
Of a geologic period within the Neoproterozoic era from about 1000 to 850 million years ago.
Where this word comes from
From Ancient Greek τόνος (tónos, “stretch”).
The Tonian period.
Where this word comes from
From Ancient Greek τόνος (tónos, “stretch”).
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.