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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.
In standard English, the phonetic realization of the two dental fricative phonemes shows less variation than many other English consonants. Both are pronounced either interdentally, with the blade of the tongue resting against the lower part of the back of the upper teeth and the tip protruding slightly, or with the tip of the tongue against the back of the upper teeth.
The voiceless dental plosive can be distinguished with the underbridge diacritic, t̪ and the postalveolar with a retraction line, t̠ , and the Extensions to the IPA have a double underline diacritic which can be used to explicitly specify an alveolar pronunciation, t͇ . The [t] sound is a very common sound cross-linguistically. [1]
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]
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.
Examples include the loss (in most dialects) of the [ç] and [x] sounds still reflected by the gh in words like night and taught, and the splitting of voiced and voiceless allophones of fricatives into separate phonemes (such as the two different phonemes represented by th ).
In most Indigenous Australian languages, there is a series of "dental" consonants, written th, nh, and (in some languages) lh. They are always laminal (pronounced by touching with the blade of the tongue) but may be formed in one of three different ways, depending on the language, the speaker, and how carefully the speaker pronounces the sound.
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.