pterygium
noun
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Definition of pterygium:

pterygium (noun):
a fleshy mass of thickened conjunctiva that grows over part of the cornea usually from the inner side of the eyeball and causes a disturbance of vision
noun. 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.