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The voiceless denti-alveolar sibilant is the only sibilant fricative in some dialects of Andalusian Spanish. It has no official symbol in the International Phonetic Alphabet , though its features would be transcribed s̻̪ or s̪̻ (using the ̻ , the diacritic marking a laminal consonant , and ̪ , the diacritic marking a dental consonant ).
It goes back to the allophonic variation in Old English (see below), where it was possible for þ to be in final position and thus voiceless in the basic form of a word, but in medial position and voiced in a related form. The loss of inflections then brought the voiced medial consonant to the end of the word.
Its phonation is voiceless, which means it is produced without vibrations of the vocal cords. In some languages the vocal cords are actively separated, so it is always voiceless; in others the cords are lax, so that it may take on the voicing of adjacent sounds. It is an oral consonant, which means air is allowed to escape through the mouth only.
The voiceless alveolar non-sibilant fricative [θ̠] or [θ͇], using the alveolar diacritic from the Extended IPA, [1] is similar to the th in English thin. It occurs in Icelandic as well as an intervocalic and word-final allophone of English /t/ in dialects such as Hiberno-English and Scouse.
There are several types (those used in English being written as th): Voiced dental fricative [ð] - as in the English this, [ðɪs]. [2] Voiceless dental fricative [θ] - as in the English thin, [θɪn]. [2] Dental ejective fricative [θʼ]
The voiceless alveolar non-sibilant affricate [t͡θ̠] or [t͡θ͇], using the alveolar diacritic from the Extended IPA, is somewhat similar to the th in some pronunciations of English eighth. It is found as a regional realization of the sequence /tr/ in some Sicilian dialects of Standard Italian .
Th-stopping is the realization of the dental fricatives [θ, ð] as stops—either dental or alveolar—which occurs in several dialects of English. In some accents, such as of Indian English and middle- or upper-class Irish English, they are realized as the dental stops [t̪, d̪] and as such do not merge with the alveolar stops /t, d/; thus, for example, tin ([tʰɪn] in Ireland and [ʈɪn ...
Its phonation is voiceless, which means it is produced without vibrations of the vocal cords. It is an oral consonant, which means air is allowed to escape through the mouth only. It is a central consonant, which means it is produced by directing the airstream along the center of the tongue, rather than to the sides.