| Definition -
A type of consonant in which the air escapes through a narrow gap
lips, teeth, and tongue, for example, the [f] in fine, the [s] in sign, and the [v] in vine.
1. [f] is a voiceless, labiodental fricative, [v] is a voiced, labiodental fricative, [s] is a voiceless, alveolar fricative, and [z] is a voiced, alveolar fricative.
Etymology - The term derives from the Latin fricare, to rub.
Oxford English Dictionary - Its first citation is from 1863:
"H belongs, therefore, to the unvocalised strong fricatives."
(Lepsius Standard Alphabet 68)