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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.
Lips are the most delicate and soft organ in our body and they have very soft surface layers of skin. They are more prone to attack from extreme climates like hot and cold than any other part. Lips are exposed to hot rays of the sun as well as cold wind and dry air and hence subject to dehydration.