Pharyngealisation
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Pharyngealisation is a secondary feature of phonemes in a language. It refers to a constriction of the pharynx produced at the same time as a consonant or vowel is produced.
Arabic also uses phonemic secondary pharyngealisation for the "emphatic" coronal consonants. The letter ayn represents a pharyngealized glottal stop in many dialects.
Ubykh, a Northwest Caucasian language formerly spoken in Russia and Turkey, uses pharyngealisation in 14 pharyngealised consonants.