LABIAL

noun

1. A consonant articulated by the lips.
2. An organ pipe having a lip that influences its sound.
3. Any of the scales bordering the mouth opening of a reptile.

adjective

1. Of or pertaining to the lips or labia.
2. Articulated by the lips, as the consonants b, m and w.
3. Of an incisor or canine, on the side facing the lips. See mesial.