PTERYGIUM - Definition

Pronunciation:		tu'rijeeum
WordNet Dictionary

	Definition:	[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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	See Also:	conjunctiva

Webster's 1913 Dictionary

	Definition:	\Pteryg"ium\, 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.

Biology Dictionary

	Definition:	This is characterized by atrophy and hyperkeratosis of the epithelium of the conjunctiva of the eye which is caused by repeated exposure to wind and dust. Clinically it is seen as a winglike growth on the nasal half of the conjunctiva, sclera, and cornea.