Proterozoic

Meanings

Proper Noun

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.

Adjective

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

Origin

protero- + -zoic

Modern English dictionary

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