Proterozoic

Pronunciation

• Rhymes: -əʊɪk

Origin

- + zoic + -

Full definition of Proterozoic

Proper noun

1. (geology) 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.

Hypernyms

• (eon 2,500-541 Ma) Precambrian - eon/supereon

Hypernyms

• (eon 2,500-541 Ma) Paleoproterozoic, Mesoproterozoic, Neoproterozoic

Coordinate terms

• (eon 2,500-541 Ma) Archaean - preceding eon, Cambrian - succeeding eon

Adjective

1. (geology) Of or relating to the geologic eon from 2,500 Ma to 541.0±1.0 Ma.