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A triangular mass of mucous membrane growing on the conjunctiva, usually near the inner canthus.
Overgrowth of the cuticle forward on the nail.
(vertebrate zoology)
A generalized vertebrate limb.



a disease of the conjunctiva of the eye in man and animals, characterized by formation of a conjunctival fold of the sclera that gradually grows on the surface of the cornea and becomes united with it. In man, pterygium is generally caused by prolonged exposure to strong wind, dust, or chemical irritants. The disease develops in the interpalpebral fissure, usually on the nasal side, in the form of a triangle whose base lies on the sclera. If the pterygium reaches the cornea’s optic zone, vision is reduced. The disease is treated surgically.

References in periodicals archive ?
In people with multiple pterygium syndrome, Escobar type, the webbing typically affects the skin of the neck, fingers, forearms, inner thighs, and backs of the knee.
Genomic, cDNA and embryonic expression analysis of zebrafish IRF6, the gene mutated in the human oral clefting disorders Van der Woude and popliteal pterygium syndromes.
Popliteal pterygium syndrome (PPS) with intra-alveolar syngnathia: A discussion of anesthetic and surgical considerations.
CASE FACTS: Paula Castillo had a pterygium in her right eye surgically removed by Dr.
The survey concluded that it is essential to take preventive measures against the reflection of sunlight off of snow because the UV exposure induces various eye diseases and risks including snow blindness and pterygium as well as cataracts.
There were major structural malformations in 14 of these cases, including skeletal dysplasias, hypoplastic left heart, multiple pterygium, and pleural effusion requiring an in utero shunt.
nodular band keratopathies, pinguecula, pterygium, photokeratitis, and epidermal carcinoma (cornea);
Damaged cells that would normally be sloughed off migrate to the outer cornea, forming a pterygium.
A pterygium can grow over the cornea, partially blocking vision.
Possible correlation of plica-limbal distance with the presence of primary medial pterygium
Studies have shown that accumulated ultraviolet exposure from the sun can heighten the risk of cataracts, a leading cause of blindness worldwide, growths such as pterygium and several kinds of eye cancer.