ARCHAEANS
Noun
archaeans
plural of archaean
Source: Wiktionary
ARCHAEAN
Ar*chæ"an, a. Etym: [Gr.
Definition: Ancient; pertaining to the earliest period in geological
history.
Ar*chæ"an, n. (Geol.)
Definition: 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.
Note: This is equivalent to the formerly accepted term Azoic, and to
the Eozoic of Dawson.
Source: Webster’s Unabridged Dictionary 1913 Edition