Labial fricative

A labial fricative is a fricative consonant, whose articulation involves the lips. Several kinds can be distinguished based on whether the articulation involves only the lips or either the teeth or the tongue:
 * Bilabial fricatives (articulated with both lips):
 * Voiceless bilabial fricative
 * Voiced bilabial fricative
 * Labiodental fricatives (articulated with the lower lip touching against the upper teeth):
 * Voiceless labiodental fricative
 * Voiced labiodental fricative
 * Linguolabial fricatives (articulated with the tip or blade of the tongue against the upper lip:
 * Voiceless linguolabial fricative or
 * Voiced linguolabial fricative or