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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 human lips (labia oris) is the junction between the outer facial skin and inner buccal mucosa that lines the mouth cavity. The outer layers are largely similar to skin except that the lips has fewer layers. The color of skin is determined by the amount of natural pigment known as melanin.