2 entries under this word

Labial

Lā'bi-al, a.

adjective

a. [L. Lat. labialis, from Lat. labium, lip; Fr. & Sp. labial, It. labiale.]

Pertaining or belonging to the lips; as, labial veins.
(Pron.) Formed by the lips; uttered principally with the lips;—said of certain letters, as b, m, and p.

noun

n. (Pron.) A letter or character representing an articulation or sound formed or uttered chiefly with the lips, as b, p, w.