plica semilunaris

noun
plica semi·lu·na·ris | \-ˌsem-i-ˌlü-ˈnar-əs \
plural plicae semilunares\-(ˌ)ēz \

Medical Definition of plica semilunaris 

: the vertical fold of conjunctiva that occupies the canthus of the eye nearer the nose and is homologous to the nictitating membrane of lower animals

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