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In English, the digraph th usually represents either the voiced dental fricative phoneme /ð/ (as in this) or the voiceless dental fricative phoneme /θ/ (as in thing). Occasionally, it stands for /t/ (as in Thailand, or Thomas). In the word eighth, it is often pronounced /tθ/.
The voiced dental fricative is a consonant sound used in some spoken languages.It is familiar to English-speakers as the th sound in father.Its symbol in the International Phonetic Alphabet is eth, or ð and was taken from the Old English and Icelandic letter eth, which could stand for either a voiced or unvoiced (inter)dental non-sibilant fricative.
This voicing of /f/ is a relic of Old English, at a time when the unvoiced consonants between voiced vowels were 'colored' by an allophonic voicing rule /f/ → [v]. As the language became more analytic and less inflectional, final vowels or syllables stopped being pronounced.
The dental fricative or interdental fricative is a fricative consonant pronounced with the tip of the tongue pressing under the teeth. [1] There are several types (those used in English being written as th):
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 ).
English voiceless stops are generally aspirated at the beginning of a stressed syllable, and in the same context, their voiced counterparts are voiced only partway through. In more narrow phonetic transcription , the voiced symbols are maybe used only to represent the presence of articulatory voicing, and aspiration is represented with a ...
Phonological rules can be roughly divided into four types: Assimilation: When a sound changes one of its features to be more similar to an adjacent sound. This is the kind of rule that occurs in the English plural rule described above—the -s becomes voiced or voiceless depending on whether or not the preceding consonant is voiced.
For example, th represents two different sounds (the voiced and voiceless dental fricatives) (see Pronunciation of English th), and the voiceless alveolar sibilant can be represented by s or c . It is, however, not (solely) the shortage of letters which makes English spelling irregular.