proterozoic

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Pronunciation

/ˌpɹoʊt(ə)ɹrəˈzoʊɪk/ (US)

See all 4 pronunciations

/ˌpɹoʊt(ə)ɹrəˈzoʊɪk/ (US) · /ˌpɹoʊt(ə)ɹoʊˈzoʊɪk/ (US) · /ˌpɹɒt(ə)ɹəˈzəʊɪk/ (UK) · /ˌpɹɒt(ə)ɹəʊˈzəʊɪk/ (UK)

Definition of proterozoic

3 senses · 2 parts of speech · etymology included

adj

(not-comparable)Of or relating to the geologic eon from 2,500 Ma to 541.0±1.0 Ma.

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adj

(not-comparable)Of or relating to the geologic eon from 2,500 Ma to 541.0±1.0 Ma.
(alt-of, alternative, not-comparable)Alternative form of Proterozoic.

name

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.

Definitions from Wiktionary, CC BY-SA.

From protero- + -zoic.

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