English noun: Proterozoic aeon | |||
1. | Proterozoic aeon (time) from 2,500 to 544 million years ago; bacteria and fungi; primitive multicellular organisms | ||
Synonyms | Proterozoic, Proterozoic eon | ||
Instance hypernym | aeon, eon | ||
Part meronym | Precambrian, Precambrian aeon, Precambrian eon, Precambrian period | ||