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The alveolar nasal is a type of consonantal sound used in numerous spoken languages. The symbol in the International Phonetic Alphabet that represents dental, alveolar, and postalveolar nasals is , and the equivalent X-SAMPA symbol is n. The vast majority of languages have either an alveolar or dental nasal. There are a few languages that lack either sound but have (e.g. colloquial Samoan). There are some languages (e.g. Rotokas) that lack both and . True dental consonants are relatively uncommon. In the Romance, Dravidian, and Australian languages, ''n'' is often called "dental" in the literature. However, the rearmost contact (which is what gives a consonant its distinctive sound) is actually alveolar or denti-alveolar. The difference between the Romance languages and English is not so much where the tongue contacts the roof of the mouth, as which part of the tongue makes the contact. In English it is the tip of the tongue (such sounds are termed apical), whereas in the Romance languages it is the flat of the tongue just above the tip (such sounds are called laminal). However, there are languages with true apical (or less commonly laminal) dental ''n''. It is found in the Mapuche language of South America, where it is actually interdental. A true dental generally occurs allophonically before in languages which have it, as in English ''tenth''. Similarly, a denti-alveolar allophone will occur in languages which have denti-alveolar stops, as in Spanish ''cinta''. Some languages contrast laminal denti-alveolar and apical alveolar nasals. For example, in the Malayalam pronunciation of ''Nārāyanan'', the first ''n'' is dental, the second is retroflex, and the third alveolar. A postalveolar nasal occurs in a number of Australian Aboriginal languages, including Djeebbana and Jingulu. ==Features== Features of the alveolar nasal: * There are four specific variants of : * * Dental, which means it is articulated with either the tip or the blade of the tongue at the upper teeth, termed respectively ''apical'' and ''laminal''. * * Denti-alveolar, which means it is articulated with the blade of the tongue at the alveolar ridge, and the tip of the tongue behind upper teeth. * * Alveolar, which means it is articulated with either the tip or the blade of the tongue at the alveolar ridge, termed respectively ''apical'' and ''laminal''. * * Postalveolar, which means it is articulated with either the tip or the blade of the tongue behind the alveolar ridge, termed respectively ''apical'' and ''laminal''. 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「Dental, alveolar and postalveolar nasals」の詳細全文を読む スポンサード リンク
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