semilunar fold

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Related to semilunar fold: semilunar fold of conjunctiva

sem·i·lu·nar fold

inconsistent curved fold connecting the palatoglossal and palatopharyngeal arches above the supratonsillar fossa; when present, it always contains lymphoid tissue.
Synonym(s): plica semilunaris [TA]
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plica semilunaris 

A crescent-shaped fold of conjunctiva located at the inner canthus lateral to the caruncle. It is a vestigial structure that represents the third eyelid or nictitating membrane of lower vertebrates. Syn. plica lunata; semilunar fold.
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann