Archaean

Definition of Archaean

Ar`chae´an
a.1.Ancient; pertaining to the earliest period in geological history.
n.1.(Geol.) The earliest period in geological period, extending up to the Lower Silurian. It includes an Azoic age, previous to the appearance of life, and an Eozoic age, including the earliest forms of life.

Related Words

archean, early, geology
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Arc
Arc lamp
Arc light
Arc of vision
arc-boutant
Arca
Arcade
Arcaded
Arcadia
Arcadian
Arcane
Arcanum
arcella
Arcellidae
Arceuthobium
Arch
Arch brick
Arch rim
Arch stone
Arch-
-Archaean-
Archaeography
Archaeolithic
Archaeologian
Archaeologic
Archaeologist
Archaeology
Archaeopteryx
archaeornis
Archaeornithes
Archaeostomatous
archaeozoic
Archaic
Archaical
Archaism
Archaist
Archaistic
Archaize
Archangel
Archangelic
Archbishop
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