It is something which hisses or whistles -- say it out loud and you'll understand.
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.
© Webster 1913.
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