/chet neek", chet"nik/ , n.
a member of a Serbian nationalist group that fought against the Turks in the early part of the 20th century and carried on guerrilla warfare during World War I and II.
[ 1905-10; cètnik guerrilla, equiv. to cèt ( a ) troop (c. ORuss cheta, Czech ceta ) + -nik agent suffix (cf. -NIK) ]