1616, in the meaning defined above
Late Greek monophthongos single vowel, from Greek mon- + phthongos sound
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From the Editors at Merriam-Webster
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Cite this Entry
“Monophthong.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/monophthong. Accessed 18 Jan. 2022.
More from Merriam-Webster on monophthong
Britannica.com: Encyclopedia article about monophthong
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