English

Paleoarchean

From paleo- + Archaean.

Ancient Greek πάλαι ‘long ago’

Ancient Greek παλαιός ‘old’

Ancient Greek ἄρχω ‘to begin, to be first in order’

Ancient Greek ἀρχή ‘beginning’

Ancient Greek ἀρχαῖος ‘ancient’

Today it means

adj Of a geologic era within the Archaean eon from about 3600 to 3200 million years ago; the first aerobic bacteria appeared at this time.

Language periods are conventional ranges, not dates for this word.

Etymograph / Paleoarchean