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Merriam-Webster’s Collegiate Dictionary, Tenth Edition is unavailable, but you can change that!

Merriam-Webster’s Collegiate Dictionary is based on the world’s largest collection of information about the way the English language is written and spoken in our time—a citation file of over 14½ million examples of English words drawn from actual use, more than 1 million collected since the last edition. The volume also includes: well-drafted Definitions and Pronunciations, Extensive...

\ˈsi-bə-lənt\ adjective [Latin sibilant-, sibilans, present participle of sibilare to hiss, whistle, of imitative origin] (1669) : having, containing, or producing the sound of or a sound resembling that of the s or the sh in sash 〈a sibilant affricate〉 〈a sibilant snake〉 — sib•i•lant•ly adverb 2sibilant noun (1788) : a sibilant speech sound (as English \s\ , \z\ , \sh\ , \zh\ , \ch(=tsh)\ , or \j(=dzh)\ )