protective fold

English Thesaurus

1. a flap of tissue that protects what it covers (noun.body)

hypernym	:	flap,
definition	:	a movable piece of tissue partly connected to the body (noun.body)

hyponym	:	eyelid, lid, palpebra,
definition	:	either of two folds of skin that can be moved to cover or open the eye (noun.body)

hyponym	:	nictitating membrane, third eyelid,
definition	:	a protective fold of skin in the eyes of reptiles and birds and some mammals (noun.body)