Precambrian

adjective
Pre·cam·bri·an | \ (ˌ)prē-ˈkam-brē-ən , -ˈkām- \

Definition of Precambrian 

: of, relating to, or being the earliest era of geological history or the corresponding system of rocks that is characterized especially by the appearance of single-celled organisms and is equivalent to the Archean and Proterozoic eons — see Geologic Time Table

Other words from Precambrian

Precambrian noun

First Known Use of Precambrian

1864, in the meaning defined above

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The first known use of Precambrian was in 1864

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