See Also: Herbal medicine (botanical medicine, herbology, phytomedicine)(health)
ivory(encyclopedia)
ivory(dictionary)
ivory(dictionary)
Ivory(medicine)
Medicine Lodge Memorial Hospital- Medicine Lodge(health)
Merchant-Ivory(dictionary)
ivory (as used in expressions)(encyclopedia)
ivory carving(encyclopedia)
Ivory Coast(tourism)

membrana nictitans (medicine) and ivory (oh)


membrana nictitans (medicine)


membrana nictitans -->
plica semilunaris conjunctivae


The semilunar fold formed by the palpebral conjunctiva at the medial angle of the eye, 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 winking-like action to clean the cornea, as in birds.

Synonym: membrana nictitans, nictitating membrane, palpebra III, palpebra tertia, third eyelid.

Synonym: plica lunata, plica semilunaris of eye, semilunar conjunctival fold.


ivory (oh)



[Date: 1200-1300; Language: Old French; Origin: ivoire, from Latin ebor, from Egyptian ab 'elephant, ivory']
[U] the hard smooth yellowish-white substance from the tusks (=long teeth) of an elephant
::an ivory chess set
[U] a yellowish white colour
::an ivory silk wedding gown
[C often plural] something made of ivory, especially a small figure of a person or animal
::a collection of Chinese ivories