Not to be confused with Yery.
For other uses, see YER (disambiguation).

A yer is one of two letters in Cyrillic alphabets, namely ъ (ѥръ, jerŭ) and ь (ѥрь, jerĭ). The Glagolitic alphabet used as their respective counterparts the letters and . They originally represented phonemically the "ultra-short" vowels in Slavic languages (including Old Church Slavonic), collectively known as the yers. In all Slavic languages they either evolved into various "full" vowels or disappeared, in some cases leaving palatalization of adjacent consonants. At present, the only Slavic language that uses "ъ" as a vowel sign (pronounced /ɤ/) is Bulgarian (although in many cases it corresponds to earlier "ѫ", originally pronounced /õ/). Many languages using the Cyrillic alphabet have kept one or more of the yers to serve specific orthographic functions.

The back yer (Ъ, ъ, italics Ъ, ъ) of the Cyrillic script, also spelled jer or er, is known as the hard sign in the modern Russian and Rusyn alphabets and as er golyam (ер голям, "big er") in the Bulgarian alphabet. Pre-reform Russian orthography and texts in Old Russian and in Old Church Slavonic called the letter "back yer". Originally this yer denoted an ultra-short or reduced middle rounded vowel.

Its companion, the front yer (Ь, ь, italics Ь, ь), now known as the soft sign in Russian, Belarusian and Ukrainian, and as er malək (ер малък, "small er") in Bulgarian, originally also represented a reduced vowel, more frontal than the ъ. Today it marks the palatalization of consonants in all of the Slavic languages written in the Cyrillic script, except in Serbian and Macedonian, which do not use it at all, although its traces remain in the forms of the palatalized letters њ and љ.

Original use

In the Old Church Slavonic language, the yer was a vowel letter, indicating the so-called "reduced vowel": ъ = *[ŭ], ь = *[ĭ] in the conventional transcription. These vowels stemmed from the Proto-Balto-Slavic short */u/ and */i/ (compare Latin angulus and Old Church Slavonic ѫгълъ, ǫgŭlŭ). In all West Slavic languages the yer either disappeared or was transformed into /e/ in strong positions, and in South Slavic languages strong yer reflexes differ widely across dialects.

Historical development

See also: Havlik's law

In Common Slavic, the yers were normal short vowels /u/ and /i/. Havlik's law caused yers in certain positions to be pronounced very weakly (perhaps as ultrashort vowels), and to lose the ability to take the word accent. These weak yers were later dropped, while the strong yers evolved into various sounds depending on the individual language.

For determining whether a yer is strong or weak, it is necessary to break the continuous flow of speech into individual words, or prosodic units (phrases which have only a single stressed syllable, and typically include a preposition or other clitic words). The rule for determining which yers are weak and which are strong is as follows:

In Russian, for example, the yers evolve as follows:

Simply put, in a string of Old Russian syllables each of which has a reduced vowel, the reduced vowels are in modern Russian alternately given full voicing and drop, and the last yer in this sequence will drop. There are some exceptions to this rule, usually considered to be the result of analogy with other words or other inflected forms of the same word, with a different original pattern of reduced vowels. Modern Russian inflection is therefore at times complicated by the so-called "transitive" (lit. беглые [ˈbʲeɡlɨjə] "fugitive" or "fleeting") vowels, which appear and disappear in place of a former yer. For example (OR = Old Russian; R = Russian):



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