Archaeozoic

Definitions

  • WordNet 3.6
    • adj archaeozoic of or belonging to earlier of two divisions of the Precambrian era "archeozoic life forms"
    • n Archaeozoic the time from 3,800 million years to 2,500 million years ago; earth's crust formed; unicellular organisms are earliest forms of life
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Webster's Revised Unabridged Dictionary
    • archaeozoic (Geol) formed in or belonging to the earlier of two divisions of the Precambrian era.
    • a archaeozoic (Zoöl) Like or belonging to the earliest forms of animal life.
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Century Dictionary and Cyclopedia
    • Archaeozoic In geology, having reference to the earliest life-forms found in the rocks: a term introduced by Le Conte and employed by Dana to designate a hypothetical division or eon of Archæan time contradistinguished from the Azoic eon. This division is founded on the assumption of the existence of life on the earth during the later stages of Archæan time, although the rocks of this age are chiefly crystalline or altered by metamorphism and vulcanism. On presumptive physical conditions Dana divided the Archæozoic into two eras: that of the first plants, such as algæ and bacteria, which might exist in an ocean having a temperature of 150° F., and of the deposition of limestone, silica, carbon, iron oxids and carbonates, in the accumulation of which plant life may have played an intermediary part;
    • n Archaeozoic The Archæozoic eon.
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Chambers's Twentieth Century Dictionary
    • adj Archaeozoic . (Gr. zōē, life), pertaining to the era of the earliest living beings on the earth
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Etymology

Webster's Revised Unabridged Dictionary
Gr. 'archai^os ancient + zw^,on animal
Chambers's Twentieth Century Dictionary
Gr. archaikosarchaios, ancient—archē, beginning.