English
Neoproterozoic
From neo- + Proterozoic.
A compound of neo- + Proterozoic
Proto-Indo-European *nu ‘now’
Proto-Indo-European *néwos ‘new’
Proto-Hellenic *néwos ‘new’
Ancient Greek νέος ‘young’
English neo-
Today it means
adj Of a geologic era within the Proterozoic eon; comprises the Tonian, Cryogenian and Ediacaran periods from about 1000 to 544 million years ago, when algae and sponges flourished.
Language periods are conventional ranges, not dates for this word.
Etymograph / Neoproterozoic