of or pertaining to the lips or labia; as, labial veins.-furnished with lips; as, a labial organ pipe.-articulated, as a consonant, mainly by the lips, as b, p, m, w.-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.-of or pertaining to the labium; as, the labial palpi of insects. see labium.-a letter or character representing an articulation or sound formed or uttered chiefly with the lips, as b, p, w.-an organ pipe that is furnished with lips; a flue pipe.-one of the scales which border the mouth of a fish or reptile.