[mon-uhf-thawng, -thong]
noun Phonetics.
a vowel retaining the same quality throughout its duration.
Compare diphthong.

1610–20; < Greek monóphthongos equivalent to mono- mono- + phthóngos sound

monophthongal [mon-uhf-thawng-guhl, -thong-] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
monophthong (ˈmɒnəfˌθɒŋ)
a simple or pure vowel
[C17: from Greek monophthongos, from mono- + thongos sound]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences for Monophthongs
There are nine phonemic monophthongs, with three phonetic lengths.
The same is perceived of four of the less productive monophthongs.
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