Pharyngeal consonant

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A pharyngeal consonant is a consonant that is articulated primarily in the pharynx. Some phoneticians distinguish upper pharyngeal consonants, or "high" pharyngeals, pronounced by retracting the root of the tongue in the mid to upper pharynx, from (ary)epiglottal consonants, or "low" pharyngeals, which are articulated with the aryepiglottic folds against the epiglottis at the entrance of the larynx, as well as from epiglotto-pharyngeal consonants, with both movements being combined.

Stops and trills can be reliably produced only at the epiglottis, and fricatives can be reliably produced only in the upper pharynx.^{[why?][citation needed]} When they are treated as distinct places of articulation, the term radical consonant may be used as a cover term, or the term guttural consonants may be used instead.

In many languages, pharyngeal consonants trigger advancement of neighboring vowels. Pharyngeals thus differ from uvulars, which nearly always trigger retraction. For example, in some dialects of Arabic, the vowel /a/ is fronted to [æ] next to pharyngeals, but it is retracted to [ɑ] next to uvulars, as in حال [ħæːl] 'condition', with a pharyngeal fricative and a fronted vowel, compared to خال [χɑːl] 'maternal uncle', with a uvular consonant and a retracted vowel.

In addition, consonants and vowels may be secondarily pharyngealized. Also, strident vowels are defined by an accompanying epiglottal trill.