pte·ryg·i·um (t -r j  -m)n. pl. pte·ryg·i·ums or pte·ryg·i·a (- -) An abnormal mass of tissue arising from the conjunctiva of the inner corner of the eye that obstructs vision by growing over the cornea. [New Latin, from Greek pterugion, diminutive of pterux, pterug-, wing; see pterygoid.] pte·ryg i·al (-l) adj. |
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| Noun | 1. |  pterygium - 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 pingueculaconjunctiva - a transparent lubricating mucous membrane that covers the eyeball and the under surface of the eyelid |
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