1. Mesoarchean - Adjective
2. Mesoarchean - Proper noun
Mesoarchean (not comparable)
(geology) Of a geologic era within the Archaean eon from about 3200 to 2800 million years ago; stromatolites have existed from this time.
Mesoarchean
(geology) The era from 3,200 Ma to 2,800 Ma.