Agnotozoic
noun or adjective
Ag·no·to·zo·ic
| \ ag-¦nō-tə-¦zō-ik, ¦ag-ˌnō- \
Definition of Agnotozoic
: algonkian , proterozoic
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Merriam-Webster unabridged
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The first known use of Agnotozoic was in 1887
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