1. Language-Linguistics(Abstract Noun) A sibilant is a type of fricative or affricate consonant, made by directing a jet of air through a narrow channel in the vocal tract towards the sharp edge of the teeth.

English: fricative, sibilant

2. Language-Linguistics(Abstract Noun) type of consonant sounds articulated with a stricture of close approximation. Here the soft palate is raised and so the nasal passage is closed completely. The active articulator is brought so close to the passive articulator that there is a very narrow gap between them and the air from the lungs escapes through this narrow gap by producing audible friction. For example, [f]

English: fricative,
Assamese: উষ্ম,
Nagamese: ghristo