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. Lowell.

 

© Webster 1913.

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