Any of several sounds produced by air flowing through a constriction in the oral cavity and typically producing a sibilant, hissing, or buzzing quality; a fricative consonant. English F and S are fricatives
Produced by the friction or rustling of the breath, intonated or unintonated, through a narrow opening between two of the mouth organs; uttered through a close approach, but not with a complete closure, of the organs of articulation, and hence capable of being continued or prolonged; said of certain consonantal sounds, as f, v, s, z, etc
a sound, such as /f/ or /z/, made by forcing your breath through a narrow opening between your lips and teeth, or your tongue and teeth (fricativus, from fricare; FRICTION)