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Word: proterozoic
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Meaning:
Adjective:
- geology Of, or relating to the geologic eon from about 2,500 to 570 million years ago; comprises the Paleoproterozoic, Mesoproterozoic and Neoproterozoic eras; marked by the build up of oxygen in the atmosphere and the emergence of primitive multicellular life.
Source: Wiktionary
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Proper noun:
- geology The Proterozoic eon.
Source: Wiktionary
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