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Winter's law—named after Werner Winter, who postulated it in 1978—is a sound law operating on Balto-Slavic short vowels */e/, */o/, */a/ (< PIE *h₂e), */i/ and */u/, according to which they lengthen before unaspirated voiced stops, and that syllable gains rising, acute accent. Compare; * PIE *sed- "to sit" (that also gave Latin ''sedeō'', Sanskrit ''sīdati'', Ancient Greek ''hézomai'' and English ''sit'') > Proto-Balto-Slavic *sēstej ( *sēd-tej) > Lithuanian ''sė́sti'', OCS ''sěsti'' (with regular *dt > *st dissimilation; OCS and Common Slavic yat /ě/ is a regular reflex of PIE/PBSl. */ē/). * PIE *h₂ebl- "apple" (that also gave English ''apple'') > Proto-Balto-Slavic *ābl- > standard Lithuanian ''obuolỹs'' (accusative ''óbuolį'') and also dialectal forms of ''óbuolas'' and Samogitian ''óbulas'', OCS ''ablъko'', modern Serbian/Croatian ''jȁbuka'', Slovene ''jábolko'' etc. Winter's law is important for several reasons. Most importantly, it is supposed to show the difference between the reflexes of PIE */b/, */d/, */g/, */gʷ/ in Balto-Slavic (in front of which Winter's law operates in closed syllable), and PIE */bʰ/, */dʰ/, */gʰ/, */gʷʰ/ (before which there is no effect of Winter's law). This shows that in relative chronology Winter's law operated before PIE aspirated stops */bʰ/, */dʰ/, */gʰ/ merged with PIE plain voiced stops */b/, */d/, */g/ in Balto-Slavic. Secondary, Winter's law is also supposed to show the difference between the reflexes of PIE *h₂e > */a/ and PIE */o/ which otherwise merged to */a/ in Balto-Slavic. When these vowels lengthen in accordance with Winter's law, one can see that old */a/ (< PIE *h₂e) has lengthened into Balto-Slavic */ā/ (which later gave Lithuanian /o/, Latvian /ā/, OCS /a/), and old */o/ has lengthened into Balto-Slavic */ō/ (which later gave Lithuanian and Latvian ''uo'', but OCS /a/). In later development that represented Common Slavic innovation, the reflexes of Balto-Slavic */ā/ and */ō/ were merged, as one can see that they both result in OCS /a/. This also shows that Winter's law operated prior to the common Balto-Slavic change */o/ > */a/. The original formulation of Winter's law stated that the vowels regularly lengthened in front of PIE voiced stops in all environments. As much as there were numerous examples that supported this formulation, there were also many counterexamples, such as OCS ''stogъ'' "stack" < PIE *stógos, OCS ''voda'' "water" < PIE * (collective noun formed from PIE *). An adjustment of Winter's law, with the conclusion that it operates only on closed syllables, was proposed by Matasović in 1994. Matasović's revision of Winter's law has been used in the Lexikon der indogermanischen Verben. Other variations of the blocking mechanism for Winter's law have been proposed by Kortlandt, Shintani, Rasmussen, Dybo and Holst. ==Criticism== Not all specialists in Balto-Slavic historical linguistics accept Winter's law. A study of counter-evidences led Patri (2006) to conclude that there is no law at all. According to him, exceptions to the law create a too heterogeneous and voluminous data-set to allow any phonological generalization. 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「Winter's law」の詳細全文を読む スポンサード リンク
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