Day·ak 
(dāăk′) or Dy·ak (dī-)
(dāăk′) or Dy·ak (dī-)n. pl. Dayak or Day·aks also Dyak or Dy·aks
1. A member of any of various Indonesian peoples inhabiting Borneo.
2. The language of the Dayak.
[Dayak Daya, Dayaq, upcountry (sense uncertain), Dayak.]