Labial (?), a. [LL. labialis, fr. L. labium lip: cf. F. labial. See Lip.] 1. Of or pertaining to the lips or labia; as, labial veins.[1913 Webster]
2. (Mus.) Furnished with lips; as, a labial organ pipe.[1913 Webster]
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 &oomacr_; (f&oomacr_;d), ō (ōld), etc., and as eu and u in French, and ö, ü in German. See Guide to Pronunciation, §§ 11, 178.[1913 Webster]
4. (Zoöl.) Of or pertaining to the labium; as, the labial palpi of insects. See Labium.[1913 Webster]
Labial, n. 1. (Phonetics) A letter or character representing an articulation or sound formed or uttered chiefly with the lips, as b, p, w.[1913 Webster]
2. (Mus.) An organ pipe that is furnished with lips; a flue pipe.[1913 Webster]
3. (Zoöl.) One of the scales which border the mouth of a fish or reptile.[1913 Webster]