Search Result for "third eyelid":
Wordnet 3.0

NOUN (1)

1. a protective fold of skin in the eyes of reptiles and birds and some mammals;
[syn: nictitating membrane, third eyelid]



WordNet (r) 3.0 (2006):

third eyelid
    n 1: a protective fold of skin in the eyes of reptiles and birds
         and some mammals [syn: nictitating membrane, third
         eyelid]