Definition of triphthong

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triph·thong

(tr

thông

, -th

, tr

-) KEY

NOUN:

A compound vowel sound resulting from the succession of three simple ones and functioning as a unit.

ETYMOLOGY:
tri- + (di)phthong

OTHER FORMS:
triph·thongal (-thông

l, -th

l) KEY (Adjective)

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