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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 vagina has no lips. The vagina is the birth canal, not the outside parts that you can see easily. The outside parts is called the  vulva, including the outer, major 'lips', called the labia majora, and an inner, small set of 'lips', called the labia minora.