proterozoic
UK /ˌpɹɒt(ə)ɹəˈzəʊɪk/ US /ˌpɹoʊt(ə)ɹrəˈzoʊɪk/
adj 2name 1
Definitions
adj
1
Of or relating to the geologic eon from 2,500 Ma to 541.0±1.0 Ma.
name
1
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.
adj
1
Alternative form of Proterozoic.
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