Fifty-six diphthongal combinations may be made from the eight vowel elements, four of which, though, we find to be necessarily triphthongs, two tetraphthongs, and one a pentaphthong.
Source: wiktionary
Pentaphthong
Synonyms for "pentaphthong"
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4 entriesSample sentences
4 total sentences available.
Try saying the Dutch word Leeuwen some time. At least a pentaphthong...
Source: wiktionary
Someone once claimed that Pres. Coolidge ( a Vermonter) pronounced the vowel in "cow" as a pentaphthong.
Source: wiktionary
Phonetically, [j] is meaningless, it's the same as an [i]. So what we have here is a pentaphthong: ui@iu.
Source: wiktionary
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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.