Proterozoic

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noun

from 2,500 to 544 million years ago;
bacteria and fungi;
primitive multicellular organisms
• Syn:
Proterozoic eon, Proterozoic aeon
• Derivationally related forms:
proterozoic
• Instance Hypernyms:
eon, aeon
• Part Holonyms:
Precambrian, Precambrian eon, Precambrian aeon, Precambrian period