from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A transparent inner eyelid in many vertebrates that closes to protect and moisten the eye.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun a
transparent protective foldof skinacting as an inner eyelidin birds, reptilesand some mammals
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun a protective fold of skin in the eyes of reptiles and birds and some mammals
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