protective fold

1. A flap of tissue that protects what it covers (synset 105321204)
   is a type of: flap - a movable piece of tissue partly connected to the body
   subtypes:

   • eyelid, lid, palpebra - either of two folds of skin that can be moved to cover or open the eye
   • nictitating membrane, third eyelid - a protective fold of skin in the eyes of reptiles and birds and some mammals

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