sibilant consonant

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Noun1.sibilant consonant - a consonant characterized by a hissing sound (like s or sh)
fricative, fricative consonant, spirant - a continuant consonant produced by breath moving against a narrowing of the vocal tract
References in periodicals archive ?
Still possessed of thick white hair and a fine-boned hardsomeness and always well-dressed, even in bed, which is where he spends most of his time these days, he is witty, but unassuming and soft-spoken, with a bit of a hiss to his sibilant consonants.