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5. A diphthong (δίφθογγος having two sounds) combines two vowels in one syllable. The second vowel is ι or υ. The diphthongs are: αι, ει, οι, α?, , ; αυ, ευ, ου, ηυ, and υι. The ι of the so-called improper diphthongs, α?, , , is written below the line and is called iota subscript. But with capital letters, ι is written on the line (adscript), as ΤΗΙ ΩΙΔΗΙ τῇ ᾠδῇ or Ὠιδῇ to the song. All diphthongs are long.

a. In , , the ι ceased to be written about 100 B.C. The custom of writing ι under the line is as late as about the eleventh century.

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  • Cross-references to this page (1):
    • Raphael Kühner, Friedrich Blass, Ausführliche Grammatik der Griechischen Sprache, KG 1.1.1
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