from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Of or belonging to the geologic time period between Hadean Time and the Cambrian Period, often subdivided into the Archean and Proterozoic eras, comprising most of the earth's history and marked by the appearance of primitive forms of life. See Table at geologic time.
- n. The Precambrian Eon.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. (geology) Relating to the eons before the Phanerozoic
from The Century Dictionary and Cyclopedia
- Noting rocks older than the Cambrian or first fossiliferous strata: used by many writers as preferable to azoic, eozoic, archæan, primitive, etc, because it is non-committal.
- n. Precambrian strata.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. the eon following the Hadean time and preceding the Phanerozoic eon; from about 3,800 million years ago until 544 million years ago
Sorry, no etymologies found.