Monophthongization is the reduction of a diphthong to a long vowel.
Monophthongization is the reduction of a diphthong to a long vowel. It is a gradual natural assimilatory phenomenon (assimilation) caused by the total conflation of the diphthong’s elements.
Evidence for the early monophthongization of the diphthongs /ei̯/ and /ou̯/ is found in various dialects: PotEdán = Poteidán ‘Poseidon’ (Corinth, 6th c. BCE; for Cor. <E> = /eː/, see del Barrio Vega 2010), katékhe = katékhei ‘(s)he detains’ (Ambracia, 6th c. BCE), tôto = toû…
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Alcorac Alonso Déniz,
Encyclopedia of Ancient Greek Language and Linguistics, Managing Editors Online Edition: First Last.
Consulted online on 22 April 2018 <http://dx.doi.org/10.1163/2214-448X_eagll_SIM_00000498>