What is Labial?

Labial definition and meaning on Dictionary terms:
of, relating to, or resembling a labium.
of or relating to the lips.
Phonetics. involving lip articulation, as p, v, m, w, or a rounded vowel.
Music. having the tones produced by the impact of a stream of air on a sharp liplike edge, as in a flute or the flue pipes of an organ.

noun Phonetics.
any labial consonant, especially a bilabial.
any labial sound.