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In phonetics and phonology, a semivowel or glide 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. In English, the consonants ''y'' and ''w'' in ''yes'' and ''west'' are semivowels, written in IPA. They correspond to the vowels , written ''ee'' and ''oo'' in ''seen'' and ''moon''. ==Classification== Semivowels form a subclass of approximants. Although "semivowel" and "approximant" are sometimes treated as synonymous, most authors agree that not all approximants are semivowels, although the exact details may vary from author to author. For example, do not consider the labiodental approximant to be a semivowel, while proposes that it should be considered one. In the International Phonetic Alphabet, the diacritic attached to non-syllabic vowel letters is . Additionally, there are dedicated symbols for four semivowels that correspond to the four close cardinal vowel sounds:〔 The pharyngeal approximant is also equivalent to the semivowel articulation of the open back unrounded vowel .〔 In addition, some authors〔〔 consider the rhotic approximants , to be semivowels corresponding to R-colored vowels such as . As mentioned above, the labiodental approximant is considered a semivowel in some treatments. An unrounded central semivowel, (also written ), equivalent to , is uncommon, though rounded (or ), equivalent to , is found in Swedish and Norwegian. 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「Semivowel」の詳細全文を読む スポンサード リンク
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