proterozoic | ||
1. | [ adjective ] (geology) formed in the later of two divisions of the Precambrian era | |
Examples: | "proterozoic life forms" |
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Related terms: | geology early | |
2. | [ noun ] (geology) from 2,500 to 544 million years ago; bacteria and fungi; primitive multicellular organisms | |
Synonyms: | proterozoic_aeon proterozoic_eon Preoterozoic_era | |
Related terms: | eon era Precambrian | |
Similar spelling: |
Proterochampsa |