proterozoic

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• March 2. 2016 from wordnet.princeton.edu

  Proterozoic — noun — english

  from 2,500 to 544 million years ago; bacteria and fungi; primitive multicellular organisms

• March 31. 2016 from wordnet.princeton.edu

  proterozoic — adjective — english

  formed in the later of two divisions of the Precambrian era; "proterozoic life forms"