monophthong
Pronunciation: /ˈmɒnəfθɒŋ, məˈnɒpθɒŋ/
noun
Phonetics- a vowel that has a single perceived auditory quality. Contrasted with diphthong, triphthong.
Origin:
early 17th century: from Greek monophthongos, from monos 'single' + phthongos 'sound'