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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 the soft and pliable fleshy tissue that connects to the front area of the cheeks. The outside of the lips is covered by skin. The gingiva attaches to the part of the lips inside the mouth that is covered by the mucous membrane. Blood vessels close to the surface of the skin give lips their red color.