Also found in: Dictionary, Thesaurus, Encyclopedia.
Related to semilunar fold: semilunar fold of conjunctiva
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]
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.