diphthong

Leave it to Cher to rock a diphthong.

From Washington Post ● Feb. 20, 2019

These lines, for example, seem to evoke a police raid on a Vampire Weekend karaoke contest:  Duke seizes Florence & the diphthong town, Quite a surprise to young fops & leeches.

From New York Times ● Jul. 23, 2012

Here is the hectoring muse of the theater, certain of every wink and diphthong.

From Time Magazine Archive

Housman's judgment of that ambitious pagan could be superimposed on the Mailer of Pieces and Pontifications without changing a diphthong: his "besetting sin is the use of words too forcible for his thoughts."

From Time Magazine Archive

Or it may be that it is so called of Wald and dene: for I have read it written in old evidences Waldæne, with a diphthong.

From Elizabethan England From 'A Description of England,' by William Harrison by William Harrison

All of the letters are in lower case and there are no double consonents, but there are "diphthongs, triphthongs, quadriphtongs and even quintiphthongs", which are combined vowel sounds.

From Fox News ● May 15, 2019

He erodes consonants, turns simple vowels into unpredictable diphthongs, and takes each new sentence as an opportunity for rococo improvisation.

From The New Yorker ● May 6, 2019

Given the text’s large swathes of Italian as Callas parses arias by Bellini, Puccini and Verdi, Ms. Daly has worked hard on her language skills and admits that those diphthongs still give her trouble.

From New York Times ● Jun. 23, 2011

The gag: Schaffer's accent is classic old-style Noo Yawk, all diphthongs and mobster cadences.

From The Guardian ● Apr. 27, 2010

C is pronounced like k before a, o, u; and like s before e, i, y, and the diphthongs æ and œ: as cado, pronounced ka'do; cedo, pronounced se'do.

From New Word-Analysis by William Swinton