Here is the hectoring muse of the theater, certain of every wink and diphthong.
From the time.com
In the case of a diphthong or a digraph, the second vowel takes the diacritics.
From the en.wikipedia.org
On a long vowel or diphthong, a sequence of low-high is realised as high-high.
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Some linguists use the terms diphthong and triphthong only in this phonemic sense.
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The height of one element of each diphthong is adjusted to match that of the other.
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The diphthong system in Northern Sami varies considerably from one dialect to another.
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A closing diphthong refers to a syllable that does not end in a consonant.
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You wouldn't have a vowel that's both long and a diphthong, like O'Conner.
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Such words may be pronounced with the full value of the diphthong, however.
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More examples
A vowel sound that starts near the articulatory position for one vowel and moves toward the position for another
A diphthong (/u02C8du026Afu03B8u0252u014B/ DIF-thong or /u02C8du026Apu03B8u0252u014B/ DIP-thong; from Greek: u03B4u03AFu03C6u03B8u03BFu03B3u03B3u03BFu03C2, diphthongos, literally "two sounds" or "two tones"), also known as a gliding vowel, is a combination of two adjacent vowel sounds within the same syllable...
A complex vowel sound that begins with the sound of one vowel and ends with the sound of another vowel, in the same syllable; A vowel digraph or ligature
(Diphthongs) are dynamic vowel sounds and require movement of some articulators. The vowel in the word "void" is a diphthong.
(Diphthongs) Vowel sounds that are so closely blended that they can be treated as single vowel units for the purposes of word identification are called diphthongs. ...
If the tongue moves significantly during the production of a vowel phone, the result is a diphthong. A diphthong sounds like a rapid, blended sequence of two separate vowels. ...
A pair of vowels that are considered a single vowel for the purpose of phonemic distinction. One of the two vowels is more prominent than the other. In writing systems, diphthongs are sometimes written with one symbol and sometimes with more than one symbol (for example, with a digraph).
Sound which cannot be represented by a single symbol, usually between successive phonemes.
A type of vowel in which two vowel sounds are connected in a continuous, gliding motion. Diphthongs are often referred to as gliding vowels. Most languages have a number of diphthongs, although that number varies widely, from only one or two to fifteen or more.