Definition of "Lid" :
noun: headdress that protects the head from bad weather; has shaped crown and usually a brim
noun: a movable top or cover (hinged or separate) for closing the opening at the top of a box, chest, jar, pan, etc.
"He raised the piano lid."
noun: either of two folds of skin that can be moved to cover or open the eye
"His lids would stay open no longer."