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|Noun||1.||protective fold - a flap of tissue that protects what it covers|
eyelid, lid, palpebra - either of two folds of skin that can be moved to cover or open the eye; "his lids would stay open no longer"
nictitating membrane, third eyelid - a protective fold of skin in the eyes of reptiles and birds and some mammals
flap - a movable piece of tissue partly connected to the body
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