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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pterygium
n : a thickened triangular layer of conjunctiva extending from
the nasal edge of the eye to the cornea; pterygia arise
from irritation of the pinguecula
[also: pterygia (pl)]