Jisho

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Wikipedia definition
1. Radical consonantRadical consonants are those consonants articulated with the root (base) of the tongue in the throat. This includes the pharyngeal, epiglottal, and epiglotto-pharyngeal places of articulation, though technically epiglottal consonants take place in the larynx. The term radical was coined to help disambiguate pharyngeal, which had come to mean any consonant articulated in the throat, whether the articulator was the back of the tongue ("high" pharyngeals) or the epiglottis ("low" pharyngeals).
Read “Radical consonant” on English Wikipedia
Read “咽喉音” on Japanese Wikipedia
Read “Radical consonant” on DBpedia

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