Pre·cam·bri·an /(ˌ)priˈkæmbriən, ˈkem-/
前寒武紀,前寒武層
Precambrian
n : the eon following the Hadean time and preceding the
Phanerozoic eon; from about 3,800 million years ago until
544 million years ago [syn: Precambrian eon, Precambrian
aeon, Precambrian period]