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."