Precambrian

1 definition found

From WordNet (r) 2.0 [wn]:

  Precambrian
       n : the eon following the Hadean time and preceding the
           Phanerozoic eon; from about 3,800 million years ago until
           544 million years ago [syn: {Precambrian eon}, {Precambrian
           aeon}, {Precambrian period}]