Labial

1. (a.) Of or pertaining to the lips or labia; as, labial veins.
2. (a.) Furnished with lips; as, a labial organ pipe.
3. (a.) Articulated, as a consonant, mainly by the lips, as b, p, m, w.
4. (a.) Modified, as a vowel, by contraction of the lip opening, as / (f/d), / (/ld), etc., and as eu and u in French, and o, u in German. See Guide to Pronunciation, // 11, 178.
5. (a.) Of or pertaining to the labium; as, the labial palpi of insects. See Labium.
6. (n.) A letter or character representing an articulation or sound formed or uttered chiefly with the lips, as b, p, w.
7. (n.) An organ pipe that is furnished with lips; a flue pipe.
8. (n.) One of the scales which border the mouth of a fish or reptile.