Proterozoic (n.)

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

    [ Syn: proterozoic , proterozoic eon , proterozoic aeon ]

    proterozoic (adj.)

  1. formed in the later of two divisions of the Precambrian era; proterozoic life forms'

The dictionary is based on the WordNet Electronic Lexical Database.
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