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In phonetics and phonology, a semivowel, glide or semiconsonant is a sound that is phonetically similar to a vowel sound but functions as the syllable boundary, rather than as the nucleus of a syllable. [1] Examples of semivowels in English are y and w in yes and west, respectively.
An example is Spanish, which distinguishes two palatal approximants: an approximant semivowel [j], which is always unrounded (and is a phonological vowel - an allophone of /i/), and an approximant consonant unspecified for rounding, [ʝ̞] (which is a phonological consonant).
Although he uses the terms interchangeably, Montreuil (2004:104) remarks that, for example, the final glides of English par and buy differ from French par ('through') and baille ('tub') in that, in the latter pair, the approximants appear in the syllable coda, whereas, in the former, they appear in the syllable nucleus.
Examples include English /w/ and /r/. In some languages, such as Spanish, there are sounds that seem to fall between fricative and approximant. One use of the word semivowel, sometimes called a glide, is a type of approximant, pronounced like a vowel but with the tongue closer to the roof of the mouth, so that there is slight turbulence.
The symbol in the International Phonetic Alphabet that represents this sound is j̃ , that is, a j with a tilde. The equivalent X-SAMPA symbol is j~, and in the Americanist phonetic notation it is ỹ . The nasal palatal approximant is sometimes called a nasal yod; [j̃] and [w̃] may be called nasal glides.
The glides in the examples can be analyzed as the result of a glide formation process that turns an underlying high vowel into a glide when followed by another vowel: /nie/ → [nje]. This process is usually blocked after a complex onset of the form obstruent + liquid (a stop or a fricative followed by /l/ or /ʁ/).
Declarative sentences show a 2–3–1 pitch pattern. If the last syllable is prominent the final decline in pitch is a glide. For example, in This is fun, this is is at pitch 2, and fun starts at level 3 and glides down to level 1. But if the last prominent syllable is not the last syllable of the utterance, the pitch fall-off is a step.
The voiced palatal lateral approximant is a type of consonantal sound used in some spoken languages.The symbol in the International Phonetic Alphabet that represents this sound is ʎ , a rotated lowercase letter y , and the equivalent X-SAMPA symbol is L.