labial

la•bi•al adj.

of or relating to the lips.
Phonetics(of a speech sound) made or pronounced using one or both lips, as the sounds /p/, /v/, /m/, /w/, or /u/.

la•bi•al adj.

of, pertaining to, or resembling a labium.
of or pertaining to the lips.
Phoneticsinvolving lip articulation, as p, v, m, w, or a rounded vowel.
Music and Dancehaving 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.

n. Phonet.

la′bi•al′i•ty, n.
la′bi•al•ly, adv.

Collins Concise English Dictionary © HarperCollins Publishers::

labial /ˈleɪbɪəl/ adj

of, relating to, or near lips or labia
producing sounds by the action of an air stream over a narrow liplike fissure, as in a flue pipe of an organ
relating to a speech sound whose articulation involves movement or use of the lips

Also called: labial pipe an organ pipe with a liplike fissure
a speech sound such as English p or m, whose articulation involves movement or use of the lips

Etymology: 16th Century: from Medieval Latin labiālis, from Latin labium lipˈlabially adv

'labial' also found in these entries (note: many are not synonyms or translations):

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