(n.) A combination of three vowel sounds in a single syllable, forming a simple or compound sound; also, a union of three vowel characters, representing together a single sound; a trigraph; as, eye, -ieu in adieu, -eau in beau, are examples of triphthongs.
Example Sentences:
Triphthongal
Definition:
(a.) Of or pertaining to a triphthong; consisting of three vowel sounds pronounced together in a single syllable.