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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.
Rash Around Mouth (Lips) Causes, Pictures, Treatment. The skin on the lips is much thinner than elsewhere on the body. It also lacks the natural moisturizing ability because there are no sebaceous glands on it. Furthermore it lacks the skin pigment, melanin, which provides protection against ultraviolet (UV) light.