Labial

Webster's Practical Dictionary- A Practical Dictionary of the Englih Language · 1884 · p. 229

la'bY-al, a. Pert, or belonging to the lips. (Pron.) Uttered principally with the lips, as 6, m, and p. — n. {Pron.) A letter representing a sound formed chiefly with the lips. — La'biate, -at, -ated, a. (Pot.) Having the T limb of a tubular corolla or calyx Label. (Her.) divided into 2 unequal parts, one projecting over the other like the lips of a mouth.