sem·i·lu·nar fold
[TA] inconsistent curved fold connecting the palatoglossal and palatopharyngeal arches above the supratonsillar fossa; when present, it always contains lymphoid tissue.
Farlex Partner Medical Dictionary © Farlex 2012
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