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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 fold
Farlex Partner Medical Dictionary © Farlex 2012
See nictitating membrane.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.