labial

American Heritage® Dictionary of the English Language, Fourth Edition

1. adj. Of or relating to the lips or labia.
2. adj. Linguistics Articulated mainly by closing or partly closing the lips, as the sounds (b), (m), or (w).
3. n. Linguistics A labial consonant.
4. n. Music See flue¹.

Century Dictionary and Cyclopedia

1. In anatomy and zoology, pertaining to the lips or to a lip-like part; situated on or by a lip; having a lip-like character, as in shape, position, or office: as, a labial vessel or nerve; a labial fold or process.
2. In entomology, pertaining to the labium, or lower lip of an insect.
3. Formed by the lips, as a sound. See II., 1.
4. Giving forth tones produced by the impact of a stream of air upon a sharp edge or lip: applied to musical instruments such as the flute or the flue-pipes of an organ.
5. n. A letter or character representing an articulate sound which in speaking is accompanied by a proximate or complete closure of the lips. The labials in English are the mutes p, b, the nasal m, and the fricative f, v (usually made between lips and teeth, and hence called more exactly labiodentals); and the semivowel w and vowels oo and o, as involving a rounding of the lips, are often ranked in the same class.
6. n. In herpetology, one of a series of plates or scales which lie along the edge of the lips, especially in Ophidia, those of the upper lip being the superior labials, those of the lower lip the inferior labials.
7. n. In entomology, one of the labial palpi.

Wiktionary

1. adj. Of or pertaining to the lips or labia
2. adj. linguistics articulated by the lips, as the consonants b, m and w
3. adj. dentistry Of an incisor or canine, on the side facing the lips. See mesial.
4. n. linguistics a labial consonant
5. n. music an organ pipe having a lip that influences its sound

GNU Webster's 1913

1. adj. Of or pertaining to the lips or labia.
2. adj. (Mus.) Furnished with lips.
3. adj. Articulated, as a consonant, mainly by the lips, as b, p, m, w.
4. 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.
5. adj. (Zoöl.) Of or pertaining to the labium. See Labium.
6. n. (Phonetics) A letter or character representing an articulation or sound formed or uttered chiefly with the lips, as b, p, w.
7. n. (Mus.) An organ pipe that is furnished with lips; a flue pipe.
8. n. (Zoöl.) One of the scales which border the mouth of a fish or reptile.

WordNet 3.0

1. adj. of or relating to the lips of the mouth
2. adj. relating to or near the female labium
3. n. a consonant whose articulation involves movement of the lips