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Ruki (or ''iurk'') refers to a sound change in Balto-Slavic, Albanian, Armenian, and Indo-Iranian, wherein an original changed to after the consonants , , , and the semi-vowels ((unicode: *u̯)) and ((unicode: *i̯)): : > / } _ Specifically, the initial stage involves the retraction of the coronal sibilant after semi-vowels, , or a velar consonant or (developed from earlier ). In the second stage, leveling of the sibilant system resulted in retroflexion (cf. Sanskrit (unicode:ष) and Proto-Slavic), and later retraction to velar 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 ((unicode:r, u̯, K, i̯)) which triggered the sound change. ==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. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Ruki sound law」の詳細全文を読む スポンサード リンク
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