pterygium

n. vascular growth extending from the inner corner of the eye to the cornea (Anatomy)

Pterygium usually refers to a benign growth of the conjunctiva. Alternately, it refers to any winglike triangular membrane occurring in the neck, eyelids, knees, elbows, ankles or digits (J Pediatr Orthop B 2004, 13:197-201). An example is popliteal pterygium syndrome, which affects the legs. The term comes from the Greek word pterygion meaning "wing".
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Pterygium /pte·ryg·i·um/ pl. ptery´gia [Gr.] a winglike structure, especially an abnormal triangular fold of membrane in the interpalpebral [more]Pterygium - Community and Resources

Noun
1. a thickened triangular layer of conjunctiva extending from the nasal edge of the eye to the cornea; pterygia arise from irritation of the pinguecula
(hypernym) conjunctiva

n. pterygium, vascular growth extending from the inner corner of the eye to the cornea (Anatomy)