A retroflex () or cacuminal () consonant is a coronal consonant where the tongue has a flat, concave, or even curled shape, and is articulated between the alveolar ridge and the hard palate. They are sometimes referred to as cerebral consonants—especially in Indology.
The Latin-derived word retroflex means "bent back"; some retroflex consonants are pronounced with the tongue fully curled back so that articulation involves the underside of the tongue tip (subapical). These sounds are sometimes described as "true" retroflex consonants. However, retroflexes are commonly taken to include other consonants having a similar place of articulation without such extreme curling of the tongue; these may be articulated with the tongue tip (Apical consonant) or the tongue blade (laminal). When apical, they have been called apico-domal consonants.
The greatest variety of combinations occurs with sibilants, because for them, small changes in tongue shape and position cause significant changes in the resulting sound. Retroflex sounds generally have a duller, lower-pitched sound than other alveolar or postalveolar consonants, especially the sibilants. The farther back the point of contact with the roof of the mouth, the more concave is the shape of the tongue, and the duller (lower pitched) is the sound, with subapical consonants being the most extreme.
The main combinations normally observed are:
The first three types of sounds above have a convex tongue shape, which gives them an additional secondary articulation of palatalization. The last type has a groove running down the center line of the tongue, which gives it a strong hissing quality. The retroflex sounds, however, have a flat or concave shape, with no associated palatalization, and no groove running down the tongue. The term "retroflex", in fact, literally means "bent back" (concave), although consonants with a flat tongue shape are commonly considered retroflex as well.
The velar bunched approximant found in northern varieties of Dutch language and some varieties of American English is acoustically similar to the retroflex approximant. It is articulated with the body of the tongue bunched up at the velum.
Retroflex consonants are transcribed in the International Phonetic Alphabet as follows:
Telugu language | ప ణము | stake; bet | |
Telugu language | టెక్కెము | banner; pennant | |
Hindi / Urdu | डब्बा / ڈبا | box | |
Telugu language | డగ్గర | phantom; apparition | |
Sanskrit | भा षा | language | |
Telugu language | మి ష | pretext | |
Polish language | żaba | frog | |
Telugu language | నె ళవు | familiarity; acquaintance | |
Swedish language | Ka rlstad | Karlstad | |
Hindi / Urdu | कीच ड़ / کیچڑ | mud | |
Marathi language | बा ळ | baby | |
Consonants with more forward articulation, in which the tongue touches the alveolar or postalveolar region rather than the hard palate, can be indicated with the retracted diacritic (minus sign below). This occurs especially for ; other sounds indicated this way, such as , tend to refer to alveolo-palatal rather than retroflex consonants.
Retroflex consonants are concentrated in the Indian subcontinent, particularly in the Indo-Aryan and Dravidian languages, but are found in other languages of the region as well, such as the Munda languages and Burushaski.
The Nuristani languages of eastern Afghanistan also have retroflex consonants. Among Eastern Iranian languages, they are common in Pashto language, Wakhi language, Sanglechi-Ishkashimi, and Munji language-Yidgha language. They also occur in some other Asian languages such as Mandarin Chinese, Javanese and Vietnamese.
The other major concentration is in the indigenous languages of Australia and the Western Pacific (notably New Caledonia). Here, most languages have retroflex plosives, nasal consonant and approximants.
Retroflex consonants are relatively rare in the European languages but occur in such languages as Swedish language, Norwegian and Faroese language in Northern Europe, some Romance languages of Southern Europe (Sardinian, Sicilian, including Calabrian and Salentino, Venetian, some Italian dialects such as Lunigiana in Italy, and some Asturian dialects in Spain), and (sibilants only) several Slavic languages (Polish language, Russian language, Serbo-Croatian, Slovak language and Sorbian). In Swedish and Norwegian, a sequence of r and a coronal consonant may be replaced by the coronal's retroflex equivalent: the name Martin is pronounced (Swedish) or (Norwegian), and nord ("north") is pronounced in (Standard) Swedish and in many varieties of Norwegian. That is sometimes done for several consonants in a row after an r: Hornstull is pronounced ).
The retroflex approximant is in free variation with the postalveolar approximant in many dialects of American English, particularly in the Midwestern United States. Polish and Russian possess retroflex , but no stops or liquids at this place of articulation.
Retroflex consonants are largely absent from indigenous languages of the Americas with the exception of the extreme south of South America, an area in the Southwestern United States as in Hopi language and O'odham, and in Alaska and the Yukon Territory as in the Athabaskan languages Gwich’in and Hän. In African languages retroflex consonants are also rare but reportedly occur in a few Nilo-Saharan languages, as well as in the Bantu language Makhuwa language and some other varieties. In southwest Ethiopia, phonemically distinctive retroflex consonants are found in Bench language and Sheko language, two contiguous, but not closely related, Omotic languages.
There are several retroflex consonants that are implied by the International Phonetic Association. In their Handbook, they give the example of , a retroflex implosive, but when they requested an expansion of coverage of the International Phonetic Alphabet by Unicode in 2020, they supported the addition superscript variants of not just but of the retroflex lateral fricatives and , of the retroflex lateral flap , and of the retroflex click release . (See Latin Extended-F.) The lateral fricatives are explicitly provided for by extIPA.
Most of these sounds are not common, but they all occur. For example, the Iwaidja language of northern Australia has a retroflex lateral flap () as well as a retroflex tap and retroflex lateral approximant ; and the Dravidian language Toda language has a subapical retroflex lateral fricative () and a Retroflex trill . The Ngadha language of Flores has been reported to have a retroflex implosive . Subapical retroflex clicks occur in Central !Kung, and possibly in Damin.
Most languages with retroflex sounds typically have only one retroflex sound with a given manner of articulation. An exception, however, is the Toda language, with a two-way distinction among retroflex sibilants between apical (post)alveolar and subapical palatal.
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