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pterygium 翼狀胬肉 翼狀□肉 pterygium n 1: either of two thickened triangular layers of conjunctiva extending from the nasal edge of the eye to the cornea; it arises from irritation of the pinguecula Pterygium \Pte*ryg"i*um\, n.; pl. E. {Pterygiums}, L.
{Pterygia}. [NL., fr. Gr. ?, properly a dim, akin to ? a feather.] (Med.) A superficial growth of vascular tissue radiating in a fanlike manner from the cornea over the surface of the eye. [1913 Webster]
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