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lip. ( 1 of an embryonic BLASTOPORE) the rim of the blastopore. ( 2 of a flower perianth) a group of perianth segments united to a greater or lesser extent, to form a distinct grouping thus divided from the rest of the perianth. ( 3 of vertebrates) one of two fleshy parts (upper and lower) surrounding the mouth.
The lips are a highly visible facial structure used in speech articulation, food consumption, and tactile sensation. Because of their prominent location on the face, lacerations of the lips can be cosmetically deforming. See the images below. Lip laceration involving the lower vermilion border.