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We found 2 dictionaries with English definitions that include the word proterozoics:
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General (2 matching dictionaries)

1. Proterozoics: Merriam-Webster.com [home, info]
2. Proterozoics: Dictionary.com [home, info]

(Note: See proterozoic for more definitions.)

Quick definitions from WordNet (Proterozoic) ▸ noun:  from 2,500 to 544 million years ago; bacteria and fungi; primitive multicellular organisms ▸ adjective:  formed in the later of two divisions of the Precambrian era ("Proterozoic life forms") ▸ Also see proterozoic ▸ Words similar to proterozoics ▸ Usage examples for proterozoics ▸ Popular adjectives describing proterozoics ▸ Popular nouns described by proterozoics ▸ Words that often appear near proterozoics ▸ Rhymes of proterozoics ▸ Invented words related to proterozoics