1867 Chambers' Encycl. IX. 670/1The Uralo-Caspian deserts. 
1876 J. B. Mitchell Dates & Data 76The Uralo-Finnic dialects of the present day. 
Ibid. 77The Uralo-Finnic speaking people. 
1877 A. H. Keane tr. Hovelacque'sSci. ofLang. vi. 308In Central Asia other Uralo-Altaïc tribes have..adopted Persian. [ sic] 
1879 Encycl. Brit. IX. 219/2It is maintained by some that the Finnic languages represent the oldest forms among the Uralo-Altaic groups. 
ORIGIN: from Ural  adjective -o- 
Uralo-
Prefix
- pertaining to Ural, especially as a political entity
Etymology
Shortened unetymologically from Ural in compounds- 20th century formation, perhaps echoing terms like Afro-, Indo-, Sino- etc.