monophthong

noun
mon·​oph·​thong | \ˈmä-nə(f)-ˌthȯŋ \

Definition of monophthong 

: a vowel sound that throughout its duration has a single constant articulatory position

Other Words from monophthong

monophthongal \ ˌmä-​nə(f)-​ˈthȯŋ-​(g)əl \ adjective

First Known Use of monophthong

1616, in the meaning defined above

History and Etymology for monophthong

Late Greek monophthongos single vowel, from Greek mon- + phthongos sound

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The first known use of monophthong was in 1616

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More from Merriam-Webster on monophthong

Britannica.com: Encyclopedia article about monophthong

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