Bible Dictionaries
Triphthong
Webster's Dictionary
(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.
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Bibliography Information
Webster, Noah. Entry for 'Triphthong'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/t/triphthong.html. 1828.