English
Mesoproterozoic
From meso- + Proterozoic.
A compound of meso- + Proterozoic
Proto-Indo-European *médʰi ‘with, among’
Proto-Indo-European *médʰyos ‘middle’
Proto-Hellenic *métsos ‘middle’
Ancient Greek μέσος ‘middle’
English meso-
Today it means
adj Of a geologic era within the Proterozoic eon; comprises the Calymmian, Ectasian and Stennian periods from about 1600 to 900 million years ago, when the Rodinia supercontinent was formed.
Language periods are conventional ranges, not dates for this word.
Etymograph / Mesoproterozoic