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| a speech sound of vowel quality used as a consonant; (w) in wet or (y) in yet |
| a voiced sound that is less sonorous than a vowel but more sonorous than a stop or fricative and that may occur as either a sonant or a consonant, as (l, r, m, n, y, w) |
diphthong
in phonetics, a gliding vowel in the articulation of which there is a continuous transition from one position to another. Diphthongs are to be contrasted in this respect with so-called pure vowels-i.e., unchanging, or steady state, vowels. Though they are single speech sounds, diphthongs are usually represented, in a phonetic transcription of speech, by means of a pair of characters indicating the initial and final configurations of the vocal tract. Many of the vowel sounds in most dialects of English are diphthongs: e.g., the vowels of "out" and "ice," represented as [au] and [ai], respectively.
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