sib·i·lance /ˈsɪbələn(t)s/
  齒擦音性
  sibilance
  齒音
  Sib·i·lance Sib·i·lan·cy n. The quality or state of being sibilant; sibilation.
     Milton would not have avoided them for their sibilancy, he who wrote . . . verses that hiss like Medusa's head in wrath.   --Lowell.
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