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