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The voiceless dental non-sibilant fricative is a type of consonantal sound used in some spoken languages. It is familiar to most English speakers as the 'th' in think . Though rather rare as a phoneme among the world's languages, it is encountered in some of the most widespread and influential ones.
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.
Voiceless nasal glottal approximant [h̃] Voiceless bilabially post-trilled dental stop [t̪ʙ̥] Voiceless bidental fricative [h̪͆] Voiceless upper-pharyngeal plosive [ʡ̟] Voiced upper-pharyngeal plosive [ʡ̟̬] Bilabial percussive [ʬ] Bidental percussive [ʭ] Sublaminal lower-alveolar percussive [¡]
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.
voiceless dental fricative [θ] (thing) voiceless dental plosive [t̪] bidental percussive [ʭ] Alveolar consonants. alveolar lateral clicks [ǁ] etc.
English voiceless stops are aspirated for most native speakers when they are word-initial or begin a stressed syllable. Pronouncing them as unaspirated in these positions, as is done by many Indian English speakers, may make them get confused with the corresponding voiced stop by other English-speakers.
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 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.