3. (Phonetics) (a) Articulated, as a consonant, mainly by the lips, as
b, p, m, w. (b) Modified, as a vowel, by contraction of the lip
opening, as (fd), (ld), etc., and as eu and u in French, and ö, ü in
German. See Guide to Pronunciation, §§ 11, 178.
4. (Zoöl.) Of or pertaining to the labium; as, the labial palpi of
insects. See Labium.
La"bi*al, n. 1. (Phonetics) A letter or character representing an
articulation or sound formed or uttered chiefly with the lips, as b, p,
w.