adj. & n.
adj. 1 Welsh. 2 Geol. of or relating to the first period in the Palaeozoic era, marked by the occurrence of many forms of invertebrate life (including trilobites and brachiopods). °Cf. Appendix II.
n. this period or system.
[ L Cambria var. of Cumbria f. Welsh Cymry Welshman or Cymru Wales ]