Archaeozoic

3 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Archaeozoic \Archaeozoic\ n. [Gr. 'archai^os ancient + zw^,on
     animal.]
     the time from 1.5 billion to 5 billion years ago; the time
     when the earth's crust formed; a time when only unicellular
     organisms and the earliest forms of life are present.
  


     Syn: Archeozoic, Archeozoic era, Archaeozoic era
          [WordNet 1.5]

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  archaeozoic \archaeozoic\, Archaeozoic \Ar`ch[ae]*o*zo"ic\, a.
     [Gr. 'archai^os ancient + zw^,on animal.] (Zool.)
     Like or belonging to the earliest forms of animal life.
     [1913 Webster]
  
     2. (Geol.) formed in or belonging to the earlier of two
        divisions of the Precambrian era. archaeozoic life forms
  
     Syn: archeozoic
          [WordNet 1.5]

From WordNet (r) 2.0 [wn]:

  archaeozoic
       adj : formed in the earlier of two divisions of the Precambrian
             era; "archeozoic life forms" [syn: {archeozoic}]
       n : the time from 3,800 million years to 2,500 million years
           ago; earth's crust formed; unicellular organisms are
           earliest forms of life [syn: {Archean}, {Archean eon}, {Archean
           aeon}, {Archeozoic}, {Archeozoic eon}, {Archaeozoic aeon}]