e-tutor.com - Online tutoring, learning, and homeschooling resources      Home    Enroll    Tour    Contact Us    Graphing Calculator         Dictionary Home    Index    About   

Definition of 'nictitating membrane'


  1. a protective fold of skin in the eyes of reptiles and birds and some mammals
       Synonyms: third eyelid

Get this dictionary without ads as part of the e-Tutor Virtual Learning Program.