Hypertext Webster Gateway: "Pterygium"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
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.
From WordNet (r) 1.7 (wn)
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
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