We found 14 dictionaries that define the word third eyelid:

General (10 matching dictionaries)

1. third eyelid: Oxford Learner's Dictionaries
2. third eyelid: American Heritage Dictionary of the English Language
3. third eyelid: Collins English Dictionary
4. third eyelid: Vocabulary.com
5. third eyelid: Dictionary.com
6. Third eyelid: Wikipedia, the Free Encyclopedia
7. third eyelid: Rhymezone
8. third eyelid: FreeDictionary.org
9. third eyelid: Mnemonic Dictionary
10. third eyelid: TheFreeDictionary.com

Computing (1 matching dictionary)

11. third eyelid: Encyclopedia

Medicine (3 matching dictionaries)

12. third eyelid: Merriam-Webster Medical Dictionary
13. online medical dictionary (No longer online)
14. third eyelid: Medical dictionary

(Note: See third_eyelids as well.)

Definitions from WordNet (third eyelid) ▸ noun:  a protective fold of skin in the eyes of reptiles and birds and some mammals Opposite: first eyelid, upper eyelid, top eyelid Phrases: third eyelid gland, third eyelid gland prolapse, more... ▸ Words similar to third eyelid ▸ Usage examples for third eyelid ▸ Idioms related to third eyelid ▸ Wikipedia articles (New!) ▸ Words that often appear near third eyelid ▸ Rhymes of third eyelid ▸ Invented words related to third eyelid