A vowel sound that glides from one quality to another is called a diphthong, and a vowel sound that glides successively through three qualities is a triphthong.
And a triphthong is any combination of three vowels beginning and ending with unstressed high vowels (as in "camb ii s" or "b uey").
The second most frequently reduced triphthong was \uei\ (10 % of the children) : the most frequent reduction form was \ei\ (7 % of the total subjects).
The very word 'triphthong' sounds faintly preposterous, as if somebody has dared a coinage with 'diphthong' and wants to have some further fun.
Triphthong reduction : triphthongs were often reduced to diphthongs (in most cases) or sometimes to monophthongs.
The number of words containing a triphthong is comparatively small, yet many of the words are quite common.
Triphthong reduction: triphthongs were often reduced to diphthongs (in most cases) or sometimes to monophthongs.
