say it: pree-KAM-bree-uhn
precambrian is a noun meaning "the eon following the Hadean time and preceding the Phanerozoic eon; from about 3,800 million years ago until 544 million years ago". It carries one recorded sense.
the eon following the Hadean time and preceding the Phanerozoic eon; from about 3,800 million years ago until 544 million years ago
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for precambrian come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.