archaean

Of or relating to Arche, the Muse of beginnings in Greek mythology.

Of, or relating to the geologic eon from about 4,031 to 2,500 million years ago; comprises the Eoarchean, Paleoarchean, Mesoarchean and Neoarchean eras; marked by an atmosphere with little oxygen, the formation of the first continents and o

The oldest vestiges of continental crust, which date from the Archaean aeon about 4 billion years ago, are in Acasta in north-west Canada.

Of or relating to the irregular Jovian moon named for Arche.

The eon from 2,500 Ma to 4,000 Ma.

Any organism of the domain Archaea.