Sibilant
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Making a hissing sound; uttered with a hissing sound; hissing;as, s, z, sh, and zh, are sibilant elementary sounds.-- n.
Sibilant meaning & definition 1 of Sibilant.
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Hissing. To hiss. A mean or subtile hiss at someone or something. The tone of the hiss depends on your mood.
Sibilant meaning & definition 2 of Sibilant.