First Known Use: circa 1599
Dictionary
triphthong
noun triph·thong \ˈtrif-ˌthȯŋ, ˈtrip-\
Definition of TRIPHTHONG
1
: a phonological unit consisting of three successive vocalic sounds in one syllable
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Origin of TRIPHTHONG
tri- + -phthong (as in diphthong)
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