that was my first thought but the word labial actually means more that:

la·bi·al Adjective /ˈlābēəl/

Synonyms:
adjective: lip
Of or relating to the lips(of the surface of a tooth) Adjacent to the lipsOf, resembling, or serving as a lip, liplike part, or labium(of a consonant) Requiring complete or partial closure of the lips (e.g., p, b, f, v, m, w), or (of a vowel) requiring rounded lips (e.g., oo in moon)
la·bi·al Noun /ˈlābēəl/

labials pluralA labial soundWeb definitionslabial consonant: a consonant whose articulation involves movement of the lipsof or relating to the lips of the mouth; “labial stops”relating to or near the female labiumhttp://wordnetweb.princeton.edu/perl/webwn?s=labial

The labial scales are the scales of snakes and other scaled reptiles that border the mouth opening. These do not include the median scales on the upper and lower jawsWright AH, Wright AA. 1957. Handbook of Snakes. Comstock Publishing Associates (7th printing, 1985). 1105 pp. ISBN 0-8014-0463-0. …http://en.wikipedia.org/wiki/Labial_(scale)

(labiality) The quality of being labial, that is, lip- or labia-likehttp://en.wiktionary.org/wiki/labiality

(labially) In a labial manner; by means of the lipshttp://en.wiktionary.org/wiki/labially

refers to the side of a tooth that is adjacent to (or the direction towards) the inside of the lip, as opposed to lingual or palatal, which refer to the side of a tooth adjacent to (or the direction towards) the tongue or palate, respectively. …http://wn.com/Commonly_used_terms_of_relationship_and_comparison_in_dentistry

The tooth surface next to the lips. Usually refers to the front teeth.http://www.merrimacksmiles.com/patient-info/dental-glossary/

The surface of the teeth in both arches that faces the lips.http://www.smartsmiles.com/faqs_glossary.htm

n : a consonant (like [p], [b], [m], [f]) uttered with the participation of one or both lips. See more at consonant.http://www.orbilat.com/General_References/Linguistic_Terms.html

Bilabial and labiodental phones are together classed as labial.http://www.cs.bham.ac.uk/~pxc/nlpa/nlpgloss.html

[ˈlebil̩] – adjective for things having to do with the lipshttp://home.cc.umanitoba.ca/~krussll/phonetics/glossary.html

the term used for the facial aspect of anterior teeth, or incisors and canines. Do not use this word for posterior teeth (premolars or molars). Labia is Latin for lips.http://www.dmdstudent.com/2007/01/31/directional-terms-to-memorize/

The tooth surface next to your lips or things mounted on the tooth surfaces next to your lips.http://www.tanos.co.uk/braces/bkb/main.php?d=./mainsite/knowledge_base/encyclopedia/&v=dental_terms&t=h&e=0

A lip sound. The sound is made at the lips.http://www.norsknettskole.no/fag/ressurser/itstud/v01/901-English_Phonetics_2/html/definitions.htm

In some reptiles, one of the scales bordering the lip.http://baileylunenburg.tripod.com/id109.html

A labial consonant has its point of articulation where both lips make contact ( bilabial: п, б, м)or the bottom lip makes contact with the teeth ( labial-dental: ф, в). There are both obstruent and sonorant labials.http://www.lesbaileyev.com/Project/cssRFterms.html

Areas nearer the lips or cheeks.http://www.csuchico.edu/anth/Module/glossary.html

Concerning the labium.http://www.geog.ubc.ca/biodiversity/efauna/InsectGlossary.html

adj. & n. 1 a of the lips. b Zool. of, like, or serving