1887 Morfill in Encycl. Brit. XXII. 145/1Servo-Croats, including those of Servia, Montenegro, the southern part of Hungary. 
Ibid. 148/2Servo-Croatian, Slovenish, Slovakish, and Bohemian possess the vocal r. 
1896 Keane Ethnol. 412Slavic Branch..Servo-Croatian. 
1897 E. A. Bartlett Battlefields of Thessaly iii. 72The last Servo-Turkish campaign, that of 1876. 
1914 W. G. Lawrence in HomeLett. T. E. Lawrence (1954) 509The Servo-Turkish war. 
ORIGIN: from Servian  adjective -o-