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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.
Skin problems health centre. Swollen lips. Swollen lips, or lip oedema, is when one or both lips enlarge or distend beyond their normal size. This swelling is caused by a build-up of fluid, or inflammation inside the lip tissue. It can have many causes, including injury, illness, certain medicines or allergies. Swollen lips can be a sign of anaphylaxis â a severe allergic reaction â which requires immediate medical attention.