Cambrian UK /ˈkam.bɹɪ.ən/US /ˈkæm.bɹi.ən/adjective 2noun 1forms 3 adjective2 •Of a geologic period within the Paleozoic era; comprises lower, middle and Furongian epochs from about 542 to 490 million years ago. •Of or relating to Wales. noun1 •A Welsh person. formsCambrians · more Cambrian · most Cambrian