third eyelid

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  • noun

Synonyms for third eyelid

a protective fold of skin in the eyes of reptiles and birds and some mammals

References in periodicals archive ?
It is visible usually only in the corner of the eye and it may be that you are seeing a prominent third eyelid.
Normally the third eyelid is held back by the position of the eyeball, so anything that makes the eyeball shrink slightly or sink back into the head can make the third eyelid more visible.
In addition, 'cherry eye' is where the third eyelid becomes swollen through no obvious reason.
The third eyelid mass was removed en bloc with complete surgical margins achieved as confirmed by histopathologic examination.
Answer: Unlike humans, many animals have what is known as a third eyelid.
Symptoms include diarrhoea and the third eyelid problem you mention.
The gland of the third eyelid has prolapsed, causing the nictitans gland to swell and become inflamed due to exposure to dry air and irritants.
The new test takes samples from a live sheep's third eyelid, reducing unnecessary slaughter.
It is visible usually only in the corner of the eye but what you are seeing could be a prominent third eyelid.
Cats have a structure called the third eyelid, which comes across the eyes from the corners.
This is cherry eye, the inflammation, swelling and resultant prolapse of the nictitans gland, which releases a secretion on the nictitans membrane, or third eyelid.
Movement of the right third eyelid could be seen through the partially transparent thin skin that covered the globe.
Later, O'Rourke had a real breakthrough when she discovered that prions collect in pockets of lymphoid tissue in a sheep's nictitating membrane, or third eyelid.
Their third eyelid might also cover part of each eye.
ACherry eye is where the third eyelid gland (which keeps the eye moist) slips out of its normal position, causing a pink swelling in the corner of the eye, so you should make an appointment to see your vet.