The sound of the English diphthong oo is commonly spelled ou.
He could not reconcile this kind of diphthong living with his notions of piety.
The "i" represents, however, the Greek diphthong ει, and is long.
"Scarlet Velvet" and "diphthong" gained the Aberdeenshire challenge-cup in 1862-63.
This had to do with the change in pronunciation of the diphthong oi.
In bead we have not a single vowel, but a kind of diphthong.
In the case of two strong vowels forming a diphthong after an accented syllable, the following rules apply.
Consider, for example, the pronunciation of the diphthong oi.
(b) There is no diphthong if an accented weak vowel follows a strong.
When the two initial vowels of the second word do not form a diphthong.
late 15c., from Middle French diphthongue, from Late Latin diphthongus, from Greek diphthongos "having two sounds," from di- "double" (see di- (1)) + phthongos "sound, voice," related to phthengesthai "utter, speak loudly."