Sibilant(redirected from Sibilous)
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a front fricative consonant, such as [s] or [z], produced by forcing the air stream through the narrow round opening formed when the edges of the front part of the upper surface of the tongue are pressed against the side teeth. Depending on how and to what extent the front part of the tongue is involved, linguists distinguish retroflex (cacuminal), apical, and dorsal sibilants. Dorsal sibilants are found in Russian.