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A complex vowel sound comprising a glide from one vowel sound to a second and then a third within a single syllable, with movement of the tongue between the three sounds. In Received Pronunciation there are five triphthongs, all of which consist of a diphthong followed by a schwa; they are the vowels in the words layer, buyer, soya, flour, and mower. Compare monophthong, diphthong, trigraph. [From Greek treis three + phthongos sound]

Subjects: Psychology.

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