[mon.oph.thong] n [LGk monophthongos single vowel, fr. Gk mon- + phthongos sound] (1616): a vowel sound that throughout its duration has a single constant articulatory position -- mon.oph.thon.gal adj
MONOPHTHONG
Meaning of MONOPHTHONG in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012