- A triangular patch of hypertrophied bulbar subconjunctival tissue, extending from the medial angle or canthus of the eye to the border of the cornea or beyond, with apex pointing toward the pupil.
- Forward growth of the cuticle over the nail plate, seen most commonly in lichen planus.
- An abnormal skin web.
Synonym(s): web eye
[G. pterygion, anything like a wing, a disease of the eye, dim. of pteryx, wing]
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