• Webster's Revised Unabridged Dictionary
    • n Diphthongation See Diphthongization.
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Century Dictionary and Cyclopedia
    • n diphthongation In philology, the formation of a diphthong; the conversion of a simple vowel into a diphthong by adding another vowel: as, Greek φαίν-ειν, from root *φαν; French rien, from Latin rem; Italian fuoco, from Latin focus, and the like.
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In literature:

Philostorgius, who saw those objects through a different medium, is inclined to forget the difference of the important diphthong.
"The History of The Decline and Fall of the Roman Empire Volume 2" by Edward Gibbon
Each word contains as many syllables as it has vowels and diphthongs.
"A Complete Grammar of Esperanto" by Ivy Kellerman Reed
Short Vowels, Long Vowels, Diphthongs.
"Scandinavian influence on Southern Lowland Scotch" by George Tobias Flom
The vowel sounds are the most vexing source of errors, especially where diphthongs are found.
"The Art of Public Speaking" by Dale Carnagey (AKA Dale Carnegie) and J. Berg Esenwein
And these they called diphthonges.
"Of the Orthographie and Congruitie of the Britan Tongue" by Alexander Hume
Give all the vowels and diphthongs their proper sounds and do not slur over them in unaccented syllables, as is done in English.
"Latin for Beginners" by Benjamin Leonard D'Ooge
In Greek words, as in Latin, there are always as many syllables as there are vowels and diphthongs.
"New Word-Analysis" by William Swinton
The =Tonics= are the simple vowels and diphthongs.
"The Ontario Readers: The High School Reader, 1886" by Ministry of Education
The diphthongs ei, ou, uo = the corresponding OHG.
"A Middle High German Primer" by Joseph Wright
The diphthongs in the following words are all that are in common use, viz.
"Orthography" by Elmer W. Cavins
He could not reconcile this kind of diphthong living with his notions of piety.
"A Circuit Rider's Wife" by Corra Harris
The I contained in this Diphthong may be regarded as standing in the place of U at the other extremity of the Scale.
"The Continental Monthly, Vol 6, No 5, November 1864" by Various
The pronunciation is rendered difficult by its numerous diphthongs.
"A New Voyage Round the World in the Years 1823, 24, 25, and 26. Vol. 1" by Otto von Kotzebue
Thus, an original a never becomes a diphthong (au, aw) in Old Breton, but remains o.
"Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 5" by Various
For the semivowels and the diphthongs, see the sequel.
"The English Language" by Robert Gordon Latham
There are six diphthongs, expressed by an unnecessarily complicated notation.
"Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 7" by Various
The aspiration of two vowels to be a diphthong.
"The Roycroft Dictionary" by Elbert Hubbard
A third mode of representing the relations of grammar is by the symbolic use of vowels and diphthongs.
"Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 3" by Various
The section on diphthongs forms an Appendix.
"Schools, School-Books and Schoolmasters" by W. Carew Hazlitt
The Serbian language being phonetic does not employ double consonants, diphthongs or triphthongs.
"Hero Tales and Legends of the Serbians" by Woislav M. Petrovitch

In news:

Gherkin, Diphthong , Hornswoggle And Kerfuffle: Best Words Ever.
Gherkin , Diphthong, Hornswoggle And Kerfuffle: Best Words Ever.
Gherkin, Diphthong, Hornswoggle And Kerfuffle: Best Words Ever.
Gherkin, Diphthong, Hornswoggle And Kerfuffle : Best Words Ever.

In science:

Diphthongs are avoided since they are considered to be nonstationary in the sense that the vocal tract resonances are changing with time.
Testing the assumptions of linear prediction analysis in normal vowels
Diphthongs are supposed to be generated by nonstationary linear dynamics, but perhaps a nonlinear predictor may model these dynamics more naturally.
Testing the assumptions of linear prediction analysis in normal vowels