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Definition of LIP
: either of two fleshy folds that surround the mouth in humans and many other vertebrates and are organs of human speech essential to certain articulations; also: the red or pinkish margin of the human lip
: 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 usually exposed when the mouth takes on its natural set
: an edge of a wound
: either of a pair of fleshy folds surrounding an orifice
: an anatomical part or structure (as a labium) resembling a lip