produced by forcing air through a constricted passage (as `f'. `s', `z', or `th' (in both `thin' and `then'))
A consonant the sound of which may be continued by expelling the breath, as f, s, sh, v.
n. [Latin] A consonant sound uttered with perceptible expiration or emission of breath-said of f, v, th surd and sonant, and the German ch.