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third eyelid
third eyelidn. See nictitating membrane.third eyelid n (Zoology) another name for nictitating membrane nic′titating mem′brane
n. a thin membrane, present in many animals, that can be drawn across the eyeball for protection. [1705–15] Thesaurus| Noun | 1. |  third eyelid - a protective fold of skin in the eyes of reptiles and birds and some mammalsnictitating membraneeye, oculus, optic - the organ of sightprotective fold - a flap of tissue that protects what it covershaw - the nictitating membrane of a horse |
EncyclopediaSeenictitating membranethird eyelid
pli·ca sem·i·lu·na·'ris of con·junc·ti·'va [TA] 1. the semilunar fold formed by the palpebral conjunctiva at the medial angle of the eye; 2. a fold of the conjunctival mucous membrane found in many animals; normally partially hidden in the medial canthus of the eye when at rest, it may be extended to cover part or all of the cornea in a winklike action to clean the cornea, as in birds. Synonym(s): membrana nictitans, nictitating membrane, palpebra III, palpebra tertia, third eyelid Synonym(s): plica semilunaris conjunctivae [TA], plica lunata, plica semilunaris of eye, semilunar conjunctival foldthird eyelidn. See nictitating membrane.third eyelid
Synonyms for third eyelidnoun a protective fold of skin in the eyes of reptiles and birds and some mammalsSynonymsRelated Words- eye
- oculus
- optic
- protective fold
- haw
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