[ 'kambrɪən ]
■ adjective
1》 (chiefly in names or geographical terms) Welsh.
2》 Geology relating to or denoting the first period in the Palaeozoic era (between the Precambrian aeon and the Ordovician period, about 570 to 510 million years ago), a time when there was extensive invertebrate life.
Origin
C17: from L. Cambria 'Wales', var. of Cumbria , from Welsh Cymry 'Welshman' or Cymru 'Wales'.