Proterozoic.
Of or relating to the geologic eon from 2,500 Ma to 541.0±1.0 Ma.
Meaning & usage
Of or relating to the geologic eon from 2,500 Ma to 541.0±1.0 Ma.
Where this word comes from
From protero- + -zoic.
The eon from 2,500 Ma to 541.0±1.0 Ma, the beginning of the Phanerozoic, marked by the build up of oxygen in the atmosphere and the emergence of primitive multicellular life.
Where this word comes from
From protero- + -zoic.
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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.