noun
- From 2, 500 to 544 million years ago; bacteria and fungi; primitive multicellular organisms.
- synonyms: Proterozoic eon, Proterozoic aeon
adjective
- Formed in the later of two divisions of the Precambrian era.
- usage: "proterozoic life forms"
WordNet 3.0 © 2006 by Princeton University
| APA | WordNet. (2010). proterozoic. Retrieved September 21, 2026, from http://smartdefine.org/proterozoic/definitions/1249827 |
| Chicago | WordNet. 2010. "proterozoic" http://smartdefine.org/proterozoic/definitions/1249827 (accessed September 21, 2026). |
| Harvard | WordNet 2010, proterozoic, Smart Define, viewed 21 September, 2026, <http://smartdefine.org/proterozoic/definitions/1249827>. |
| MLA | WordNet. "proterozoic" 23 October 2010. Web. 21 September 2026. <http://smartdefine.org/proterozoic/definitions/1249827> |