Chetnik Syllabification: (Chet·nik)Pronunciation: /ˈCHetnik/Definition of Chetnik noun a member of a Slavic nationalist guerrilla force in the Balkans, especially one active during World War II. Origin: early 20th century: from Serbian četnik, from četa 'band, troop'Chetnik in other Oxford dictionaries Definition of Chetnik in the British & World English dictionary