Cambrian
/ˈkæmbrɪən/adjective
1
- (chiefly in names or geographical terms) Welsh主要用于名称或地理名威尔士的：
the Cambrian Railway.
威尔士铁路。
2
- Geology of, relating to, or denoting the first period in the Palaeozoic era, between the end of the Precambrian aeon and the beginning of the Ordovician period【地质】寒武纪的。
2.1
- as noun the Cambrian the Cambrian period or the system of rocks deposited during it寒武纪; 寒武系（寒武纪形成的岩层）。
The Cambrian lasted from about 570 to 510 million years ago and was a time of widespread seas. It is the earliest period in which fossils, notably trilobites, can be used in geological dating.
词源
mid 17th cent.: from Latin Cambria 'Wales', variant of Cumbria, from Welsh Cymry 'Welshman' or Cymru 'Wales'.