sib·i·lant /ˈsɪbələnt/
 (a.)惙惙作聲的齒擦音
 sib·i·lant /ˈsɪbələnt/ 形容詞
 Sib·i·lant a.  Making a hissing sound; uttered with a hissing sound; hissing; as, s, z, sh, and zh, are sibilant elementary sounds. -- n. A sibiliant letter.
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 sibilant
      adj : of speech sounds produced by forcing air through a
            constricted passage (as `f', `s', `z', or `th' in both
            `thin' and `then') [syn: fricative, spirant]
      n : a consonant characterized by a hissing sound (like s or sh)
          [syn: sibilant consonant]