Araucanian adjective 2noun 1forms 3 adjective2 •(offensive) Of or in the Mapudungun or Mapuche language. •(offensive, old-fashioned) Synonym of Mapuche.On 12 February 1541 Valdivia founded the city of Santiago, but within six months it was destroyed by Araucanian Indians, one of the most bellicose peoples encountered by the Spaniards; […] — 1992 noun1 •(offensive) A member of the Mapuche people. formsAraucanians · more Araucanian · most Araucanian