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Meaning of Precambrian

Pre•cam•bri•an

Pronunciation: (prē-kam'brē-un, -kām'-), [key]
— Geol. Geol.
—adj.
  1. noting or pertaining to the earliest era of earth history, ending 570 million years ago, during which the earth's crust formed and life first appeared in the seas. See table under
—n.
  1. the Precambrian Era.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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