The Collaborative International Dictionary of English v.0.48:
Palpebra \Pal"pe*bra\, n.; pl. Palpebr[ae]. [L.] (Zool.) The eyelid. [1913 Webster]WordNet (r) 3.0 (2006):
palpebra n 1: either of two folds of skin that can be moved to cover or open the eye; "his lids would stay open no longer" [syn: eyelid, lid, palpebra]