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A centering diphthong is one that begins with a more peripheral vowel and ends with a more central one, such as [ɪə̯], [ɛə̯], and [ʊə̯] in Received Pronunciation or [iə̯] and [uə̯] in Irish. Many centering diphthongs are also opening diphthongs ([iə̯], [uə̯]). Diphthongs may contrast in how far they open or close.
In Old English, two forms of harmonic vowel breaking occurred: breaking and retraction and back mutation.. In prehistoric Old English, breaking and retraction changed stressed short and long front vowels i, e, æ to short and long diphthongs spelled io, eo, ea when followed by h or by r, l + another consonant (short vowels only), and sometimes w (only for certain short vowels): [3]
The major characteristic of the Southern drawl is vowel breaking: the shifting of a monophthong into a diphthong or even a triphthong.In the Southern accent, the short front vowels /æ/, /ɛ/, and /ɪ/ may be somewhat raised (or become an up-gliding diphthong, or both) before finally centralizing towards a schwa-like off-glide [ə].
ui sometimes represented the diphthong /ui̯/, as in cui listen ⓘ and huic. [27] The diphthong ei mostly had changed to ī by the classical epoch; ei remained only in a few words such as the interjection hei. If there is a tréma above the second vowel, both vowels are pronounced separately: aë [ä.ɛ], aü [a.ʊ], eü [e.ʊ] and oë [ɔ.ɛ].
Diphthongs are typically specified with a non-syllabic diacritic, as in ui̯ or u̯i , or with a superscript for the on- or off-glide, as in uⁱ or ᵘi . Sometimes a tie bar is used: u͜i , especially when it is difficult to tell if the diphthong is characterized by an on-glide or an off-glide or when it is variable. Notes
The diphthongs /juː/ or /ɪʊ̯/ are most commonly indicated by the spellings eu, ew, uCV (where C is any consonant and V is any vowel), ue and ui, as in feud, few, mute, cue and suit, while the historical monophthong /uː/ is commonly indicated by the spellings oo and ou, as in moon and soup.
Monophthongization is a sound change by which a diphthong becomes a monophthong, a type of vowel shift. It is also known as ungliding, [1] [2] as diphthongs are also known as gliding vowels. In languages that have undergone monophthongization, digraphs that formerly represented diphthongs now
There are two complementary definitions of vowel, one phonetic and the other phonological.. In the phonetic definition, a vowel is a sound, such as the English "ah" / ɑː / or "oh" / oʊ /, produced with an open vocal tract; it is median (the air escapes along the middle of the tongue), oral (at least some of the airflow must escape through the mouth), frictionless and continuant. [4]