‖Pte‐ryg″i‐um (?), n.; pl. E. Pterygiums (#), L. Pterygia (#). (Med.) A superficial growth of vascular tissue radiating in a fanlike manner from the cornea over the surface of the eye.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.