| involving lip articulation or a rounded vowel |
| a voiced sound that is less sonorous than a vowel but more sonorous than a stop or fricative and that may occur as either a sonant or a consonant, as (l, r, m, n, y, w) |
retroflex
in phonetics, a consonant sound produced with the tip of the tongue curled back toward the hard palate. In Russian the sounds sh, zh (like the English s sound in "pleasure"), and shch are retroflex; there are also many retroflex consonants in the languages of India.
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