When describing regional accents, the linguist decided to diphthongize the vowel in the final syllable to reflect the speaker's pronunciation.

Linguists documented the diphthongation of the short vowel in several rural communities.

The linguistics professor asked the students to identify diphthongations in the recorded speech sample.

When analyzing Homeric metrics, a spurious diphthong often indicates that ει or ου represents a long vowel caused by compensatory lengthening or contraction rather than an original diphthong.

In her phonetics paper, she argued that the observed spurious diphthongs were artifacts of the recording process.

The anthropologist documented the diphthongisation of regional vowels over a century of recordings.

The linguistics paper documented several diphthongisations across the regional dialects, noting patterns related to social class and age.

Linguists debated whether the newly discovered diphthongoids should be classified as phonemes or mere allophones.

The linguist described the vowel as a diphthongoid rather than a clear monophthong or diphthong.

In casual speech, the speaker's local dialect diphthongises several vowels, changing the sound of familiar words.