Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun proterozoic_eon

1 sense of proterozoic eon

Sense 1
Proterozoic, Proterozoic eon, Proterozoic aeon -- (from 2,500 to 544 million years ago; bacteria and fungi; primitive multicellular organisms)
       INSTANCE OF=> eon, aeon -- (the longest division of geological time)