epitarsus

A fold of conjunctiva arising on the tarsal surface of the lid and losing itself in the skin close to the medial angle of the eye. [epi- + G. tarsos, flat mat, edge of eyelid]

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epi·tar·sus (ep″ĭ-tahrґsəs) [epi- + tarsus] a congenital anomaly of the eye consisting of a fold of conjunctiva passing from the fornix to near the lid border; called also congenital pterygium.