Archeozoic

noun
the time from 3,800 million years to 2,500 million years ago; earth's crust formed; unicellular organisms are earliest forms of life
Derivationally related forms: ↑archaeozoic (for: ↑Archaeozoic), ↑archeozoic, ↑archean (for: ↑Archean)
Instance Hypernyms: ↑eon, ↑aeon

* * *

/ahr'kee euh zoh"ik/, Geol.
adj.
1. noting or pertaining to the earlier half of the Precambrian Era, from about 5 billion to 2.5 billion years ago, during which the earliest datable rocks were formed and from which the oldest known fossil forms, blue-green algae and bacteria, have been recovered. See table under geologic time.
n.
2. the Archeozoic division of geologic time or the rock systems formed then.
[1870-75; ARCHEO- + Gk zo(é) life + -IC]

Useful english dictionary. 2012.

Look at other dictionaries:

  • Archeozoic — n. 1. 1 the time from 1.5 billion to 5 billion years ago, when the earth s crust was formed; the time when only unicellular organisms and the earliest forms of life are present. Same as {Archaeozoic}. Syn: Archaeozoic, Archeozoic era, Archaeozoic …   The Collaborative International Dictionary of English

  • archeozoic — adj. 1. 1 (Geol.) same as {archaeozoic}. Syn: archaeozoic [WordNet 1.5] …   The Collaborative International Dictionary of English

  • Archeozoic — [är΄kē ə zō′ik] adj. [ ARCHEO + ZOIC] early Precambrian; Archean the Archeozoic THE ARCHEAN (see phrase under ARCHEAN) …   English World dictionary

  • archeozoic — adjective of or belonging to earlier of two divisions of the Precambrian era archeozoic life forms • Syn: ↑archaeozoic • Similar to: ↑early • Derivationally related forms: ↑Archaeozoic (for: ↑ …   Useful english dictionary

  • Archeozoic — also Archaeozoic adjective Date: 1872 Archean 1 • Archeozoic noun …   New Collegiate Dictionary

  • Archeozoic — /ahr kee euh zoh ik/, Geol. adj. 1. noting or pertaining to the earlier half of the Precambrian Era, from about 5 billion to 2.5 billion years ago, during which the earliest datable rocks were formed and from which the oldest known fossil forms,… …   Universalium

  • Archeozoic — Ar•che•o•zo•ic [[t]ˌɑr ki əˈzoʊ ɪk[/t]] adj. 1) gel of or pertaining to the earlier half of the Precambrian Era, before 2.5 billion years ago, when the only life forms were blue green algae and bacteria 2) gel the Archeozoic division of geologic… …   From formal English to slang

  • Archeozoic — 1. noun The Archaean Eon. 2. adjective Pertaining to the Archaean Eon …   Wiktionary

  • archeozoic — adj. referring to the earliest geological era …   English contemporary dictionary

  • archeozoic — ar·cheo·zo·ic …   English syllables

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