noun
- From 2, 500 to 544 million years ago; bacteria and fungi; primitive multicellular organisms.
- synonyms: Proterozoic, Proterozoic aeon
WordNet 3.0 © 2006 by Princeton University
| APA | WordNet. (2010). proterozoic eon. Retrieved September 21, 2026, from http://smartdefine.org/proterozoic_eon/definitions/1304212 |
| Chicago | WordNet. 2010. "proterozoic eon" http://smartdefine.org/proterozoic_eon/definitions/1304212 (accessed September 21, 2026). |
| Harvard | WordNet 2010, proterozoic eon, Smart Define, viewed 21 September, 2026, <http://smartdefine.org/proterozoic_eon/definitions/1304212>. |
| MLA | WordNet. "proterozoic eon" 23 October 2010. Web. 21 September 2026. <http://smartdefine.org/proterozoic_eon/definitions/1304212> |