a. 1. (Geog.) Of or pertaining to Cambria or Wales. [ 1913 Webster ]
2. (Geol.) Of or pertaining to the lowest subdivision of the rocks of the Silurian or Molluscan age; -- sometimes described as inferior to the Silurian. It is named from its development in Cambria or Wales. See the Diagram under Geology. [ 1913 Webster ]
(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 aeon, Precambrian eon, Precambrian period
(n) one of the four countries that make up the United Kingdom of Great Britain and Northern Ireland; during Roman times the region was known as Cambria, Syn. Cymru, Cambria