n 1  :  either of the two fleshy folds which surround the opening of the mouth in humans and many other vertebrates and in humans are organs of speech essential to certain articulations : also  :  the pinkish or reddish margin of a human lip composed of nonglandular mucous membrane and usu. exposed when the mouth takes on its natural set  2  :  an edge of a wound  3  :  either of a pair of fleshy folds surrounding an orifice  4  :  an anatomical part or structure (as a labium) resembling a lip lip*like adj 
 
 
 
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