triphthong

noun
triph·thong | \ˈtrif-ˌthȯŋ, ˈtrip-\

Definition of triphthong 

1 : a phonological unit consisting of three successive vocalic sounds in one syllable

2 : trigraph

Other Words from triphthong

triphthongal \trif-ˈthȯŋ-gəl, trip-, -əl \ adjective

First Known Use of triphthong

circa 1599, in the meaning defined at sense 1

History and Etymology for triphthong

tri- + -phthong (as in diphthong)

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The first known use of triphthong was circa 1599

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