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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.
lip definition: The definition of a lip is either the top or bottom edges of the mouth, something that resembles these, or an outer or upper edge or rim. (noun) An example of a lip is what's used when kissing. An example of a lip is the edge of ...