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4 definitions found
 for Diphthong
From The Collaborative International Dictionary of English v.0.48 :

  Diphthong \Diph"thong\ (?; 115, 277), n. [L. diphthongus, Gr. ?;
     di- = di`s- twice + ? voice, sound, fr. ? to utter a sound:
     cf. F. diphthongue.] (Ortho["e]py)
        (a) A coalition or union of two vowel sounds pronounced in
            one syllable; as, ou in out, oi in noise; -- called a
            proper diphthong.
        (b) A vowel digraph; a union of two vowels in the same
            syllable, only one of them being sounded; as, ai in
            rain, eo in people; -- called an improper diphthong.
            [1913 Webster]

From The Collaborative International Dictionary of English v.0.48 :

  Diphthong \Diph"thong\, v. t.
     To form or pronounce as a diphthong; diphthongize. [R.]
     [1913 Webster]

From WordNet (r) 3.0 (2006) :

      n 1: a vowel sound that starts near the articulatory position
           for one vowel and moves toward the position for another

From Moby Thesaurus II by Grady Ward, 1.0 :

  67 Moby Thesaurus words for "diphthong":
     allophone, alveolar, apico-alveolar, apico-dental, articulation,
     aspiration, assimilation, bilabial, cacuminal, cerebral, check,
     consonant, continuant, dental, dissimilation, epenthetic vowel,
     explosive, glide, glottal, glottalization, guttural, labial,
     labialization, labiodental, labiovelar, laryngeal, lateral,
     lingual, liquid, manner of articulation, modification, monophthong,
     morphophoneme, mute, nasal, occlusive, palatal, parasitic vowel,
     peak, pharyngeal, pharyngealization, phone, phoneme, plosive,
     prothetic vowel, retroflex, segmental phoneme, semivowel, sonant,
     sonority, speech sound, stop, surd, syllabic nucleus,
     syllabic peak, syllable, transition sound, triphthong, velar,
     vocable, vocalic, vocoid, voice, voiced sound, voiceless sound,
     voicing, vowel

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