Chetnik
noun
Chet·nik chet-ˈnēk 
ˈchet-nik
1
: an irregular Slav soldier in the Balkans
especially : a member of various irregular Serbian military forces that in periods of disorder (as during World War II and following the breakup of Yugoslavia in 1991) pursued ultranationalist aims
2
: an ultranationalist Serb
Word History
Etymology
Serbian četnik, from četa band, troop
First Known Use
1909, in the meaning defined at sense 1