Cambrian

1. ADJ of, denoting, or formed in the first 65 million years of the Palaeozoic era, during which marine invertebrates, esp trilobites, flourished 寒武紀(jì)的; 古生代的第一個紀(jì)，在此紀(jì)海生無脊椎動物，尤其是三葉蟲処於旺盛時期

2. N the Cambrian period or rock system 寒武紀(jì); 寒武系(寒武紀(jì)形成的巖石系統(tǒng))