Catford notes that most languages with rounded front and back vowels use distinct types of labialization, protruded back vowels and compressed front vowels. However, a few languages, such as
Scandinavian languages, have protruded front vowels. One of them,
Swedish, even contrasts the two types of rounding in front vowels as well as height and duration. As there are no diacritics in the IPA to distinguish protruded and compressed rounding, the old diacritic for labialization, , will be used here as an
ad hoc symbol for protruded front vowels. Another possible transcription is or (a near-close front vowel modified by endolabialization), but that could be misread as a diphthong. A
close-mid (near-)front protruded vowel may be narrowly transcribed with , , or . For the fully front variant of this vowel transcribed with , see the
close-mid front protruded vowel. Acoustically, this sound is "between" the more typical compressed near-close front vowel and the unrounded near-close front vowel .
Features The prototypical has a weak rounding (though it is compressed, rather than protruded), more like than the neighboring cardinal vowels.
Occurrence ==References==