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Ruki sound law

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Title: Ruki sound law  
Author: World Heritage Encyclopedia
Language: English
Subject: History of Proto-Slavic, Indo-European sound laws, Slavic second palatalization, Proto-Indo-European phonology, Proto-Indo-Iranian language
Collection: Indo-European Linguistics, Sound Laws
Publisher: World Heritage Encyclopedia

Ruki sound law

Ruki (or iurk) refers to a sound change in Balto-Slavic, Albanian, Armenian,[1] and Indo-Iranian, wherein an original *s changed to after the consonants *r, *k, *g, and the semi-vowels *w (*u̯) and *y (*i̯):

*s > / {*r, *w, *K, *y} _

Specifically, the initial stage involves the retraction of the coronal sibilant *s after semi-vowels, *r, or a velar consonant *k or *g (developed from earlier *k, *g, *gʰ). In the second stage, leveling of the sibilant system resulted in retroflexion (cf. Sanskrit [ʂ] and Proto-Slavic), and later retraction to velar *x in Slavic and some Middle Indian languages. This rule was first formulated for the Indo-European languages by Holger Pedersen, and it is known sometimes as the Pedersen law.

The name "ruki" comes from the sounds (r, u̯, K, i̯) which triggered the sound change.


  • Applications to language groups 1
    • Exceptions in Slavic languages 1.1
    • Exceptions in Indo-Iranian languages 1.2
  • Further reading 2
  • Notes 3

Applications to language groups

The rule was originally formulated for Sanskrit. It was later proposed to be valid in some degree for all Satem languages, and exceptionless for Indo-Iranian languages. In Baltic and Albanian, it is more or less limited or affected by other sound laws. Nevertheless, it has to have been universal in these branches of the IE languages, and the lack of Slavic reflexes before consonants is due rather to their merger with the reflexes of other sibilants.

Exceptions in Slavic languages

In Slavic languages the process is regular before a vowel, but it does not take place before consonants. The final result is the voiceless velar fricative *x, which is even more retracted than the . This velar fricative changed back into before a front vowel or the palatal approximant *y.

Exceptions in Indo-Iranian languages

In Indo-Iranian *r and *l merged, and the change worked even after the new sound. This has been cited as evidence by many scholars as an argument for the later influence of Iranian languages on Proto-Slavic. There are obvious drawbacks in the theory. First, the two sounds must have been very close (r/l), so that both could have triggered the change in Indo-Iranian. Second, there are no real examples of this change working in Slavic, and it is also doubtful that only this change (ruki) and no other such change of sibilants (e.g. *s > h) was borrowed into Slavic.

Further reading

  • Charles Prescott. "Germanic and the Ruki Dialects"


  1. ^ Mayer, Harvey E. (1980), "Baltic Membership in the West Satem Group", Journal of Baltic Studies 11 (4): 356–366 
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