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An open-mid vowel (also mid-open vowel, low-mid vowel, mid-low vowel or half-open vowel) is any in a class of vowel sound used in some spoken languages. The defining characteristic of an open-mid vowel is that the tongue is positioned one third of the way from an open vowel to a close vowel.
The open-mid vowels that have dedicated symbols in the International Phonetic Alphabet are:
- open-mid front unrounded vowel [ɛ]
- open-mid front rounded vowel [œ]
- open-mid central unrounded vowel [ɜ] (older publications may use 〈ɛ̈〉)
- open-mid central rounded vowel [ɞ] (older publications may use 〈ɔ̈〉)
- open-mid back unrounded vowel [ʌ]
- open-mid back rounded vowel [ɔ]
Other open-mid vowels can be indicated with diacritics of relative articulation applied to letters for neighboring vowels.