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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 not uncommon, but often overlooked site for nonmelanoma skin cancers (NMSC), including the two most common skin cancers, basal and squamous cell carcinoma (BCC and SCC). The lower lip is approximately 12 times more likely to be affected, owing to its greater exposure to sunlight.