Labial consonant
"Labials are consonants articulated either with both lips (bilabial articulation) or with the lower lip and the upper teeth (labiodental articulation). English [m] is a bilabial nasal sonorant, [b] and [p] are bilabial stops (plosives), [v] and [f] are labiodental fricatives."
"Bilabial fricatives and the bilabial approximant do not exist in standard English, but do occur in many languages. For example, the Spanish consonant spelt b or v is pronounced as a voiced bilabial approximant between vowels."
