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There are, however, a host of other vowel combinations (more than any other major Romance language) which are classified as vowel glides. As a result of their origin (diphthongization of mid vowels under stress), the two true diphthongs appear only in stressed syllables [52] and make morphological alternations with the mid vowels /e/ and /o/.
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]
As a general rule, this vowel almost always acts as a joint-stem to connect two consonantal roots (e.g. arthr-+ -o-+ -logy = arthrology), but generally, the -o-is dropped when connecting to a vowel-stem (e.g. arthr-+ -itis = arthritis, instead of arthr-o-itis). Second, medical roots generally go together according to language, i.e., Greek ...
Mid-centralized vowels are closer to the midpoint of the vowel space than their referent vowels. That is, they are closer to the mid-central vowel schwa [ə] not just by means of centralization, but also by raising or lowering. The diacritic used to mark this in the International Phonetic Alphabet is the over-cross, U+033D ̽ COMBINING X ABOVE.
In Greek synaeresis, two vowels merge to form a long version of one of the two vowels (e.g. e + a → ā), a diphthong with a different main vowel (e.g. a + ei → āi), or a new vowel intermediate between the originals (e.g. a + o → ō). Contraction of e + o or o + e leads to ou, and e + e to ei, which are in this case spurious diphthongs.
The resulting vowel is often long, and either between the two original vowels in vowel space, as in [ai] → [eː] → [e] and [au] → [oː] → [o] in French (compare English day [deɪ] and law [lɔː]), in Hindi (with [ɛː], [ɔː]), and in some varieties of Arabic; or combines features of the vowels, as in [ui] → [yː] → [y] and [oi ...
In phonetics, a triphthong (UK: / ˈ t r ɪ f θ ɒ ŋ, ˈ t r ɪ p θ ɒ ŋ / TRIF-thong, TRIP-thong, US: /-θ ɔː ŋ /-thawng) (from Greek τρίφθογγος triphthongos, lit. ' with three sounds ' or ' with three tones ') is a monosyllabic vowel combination involving a quick but smooth movement of the articulator from one vowel quality to another that passes over a third.
The shift causes the vowel sound in words like cot, nod and stock and the vowel sound in words like caught, gnawed and stalk to merge into a single phoneme; therefore the pairs cot and caught, stock and stalk, nod and gnawed become perfect homophones, and shock and talk, for example, become perfect rhymes.