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Adjective: proterozoic
  1. (geology) formed in the later of two divisions of the Precambrian era
    "proterozoic life forms"
Noun: Proterozoic  ,prow-tu-row'zow-ik
  1. From 2,500 to 544 million years ago; bacteria and fungi; primitive multicellular organisms
    - Proterozoic eon, Proterozoic aeon

See also: early

Type of: aeon, eon

Part of: Precambrian, Precambrian aeon, Precambrian eon, Precambrian period

Encyclopedia: Proterozoic