Finno-Ugric (ˌfɪnoʊˈjuːɡrɪk or ˌfɪnoʊˈuːɡrɪk; Fenno-Ugric) or Finno-Ugrian (Fenno-Ugrian) is a traditional grouping of all languages in the Uralic language family except the Samoyedic languages. Its formerly commonly accepted status as a subfamily of Uralic is based on criteria formulated in the 19th century and is criticized by some contemporary linguists such as Tapani Salminen and Ante Aikio as inaccurate and misleading. The three most-spoken Uralic languages, Hungarian, Finnish, and Estonian, are all included in Finno-Ugric, although linguistic roots common to both branches of the traditional Finno-Ugric language tree (Finno-Permic and Ugric) are distant.
The term Finno-Ugric, which originally referred to the entire family, is sometimes used as a synonym for the term Uralic, which includes the Samoyedic languages, as commonly happens when a language family is expanded with further discoveries.
The validity of Finno-Ugric as a phylogenic grouping is under challenge, with some linguists maintaining that the Finno-Permic languages are as distinct from the Ugric languages as they are from the Samoyedic languages spoken in Siberia, or even that none of the Finno-Ugric, Finno-Permic, or Ugric branches has been established. Received opinion is that the easternmost (and last-discovered) Samoyed had separated first and the branching into Ugric and Finno-Permic took place later, but this reconstruction does not have strong support in the linguistic data.
Pre-Finno-Ugric substrate
Attempts at reconstructing a Proto-Finno-Ugric proto-language, a common ancestor of all Uralic languages except for the Samoyedic languages, are largely indistinguishable from Proto-Uralic, suggesting that Finno-Ugric might not be a historical grouping but a geographical one, with Samoyedic being distinct by lexical borrowing rather than actually being historically divergent. It has been proposed that the area in which Proto-Finno-Ugric was spoken reached between the Baltic Sea and the Ural Mountains.