adj. Of or pertaining to the lips or labia.adj. Furnished with lips.adj. adj. Articulated, as a consonant, mainly by the lips, as b, p, m, w.adj. Modified, as a vowel, by contraction of the lip opening, as � (f�d), ō (ōld), etc., and as eu and u in French, and ö, ü in German. See Guide to Pronunciation, §§ 11, 178.adj. Of or pertaining to the labium. See Labium.n. A letter or character representing an articulation or sound formed or uttered chiefly with the lips, as b, p, w.n. An organ pipe that is furnished with lips; a flue pipe.n. One of the scales which border the mouth of a fish or reptile.