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An open vowel is a vowel sound in which the tongue is positioned approximately as far as possible from the roof of the mouth. Open vowels are sometimes also called low vowels (in U.S. terminology) in reference to the low position of the tongue.
In the context of the phonology of any particular language, a low vowel can be any vowel that is more open than a mid vowel. That is, , , and open vowels can all be considered low vowels.
There also are central vowels that do not have dedicated symbols in the IPA:
There is no unambiguous way of transcribing the open central vowels (but see obsolete/nonstandard IPA ᴀ). The diaeresis indicates centralization, so could mean near-front and could mean near-back. However, in practice the diaeresis is assumed to mean central, while and are used for the front and back articulations, respectively.
The extremely rare contrast between open front, central and back unrounded vowels has been reported to occur in the Hamont-Achel dialect of Limburgish, which features long versions of these sounds, as well as short versions of the open front and back vowels. The short versions do not contrast directly with the open central vowel, which can only be long.
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