Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
sibilant is a noun and adjective meaning "a consonant characterized by a hissing sound (like s or sh)". It carries 2 recorded senses.
a consonant characterized by a hissing sound (like s or sh)
of speech sounds produced by forcing air through a constricted passage (as `f', `s', `z', or `th' in both `thin' and `then')
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for sibilant come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.