pterygium

== English == === Etymology === From Ancient Greek πτερύγιον (pterúgion), diminutive of πτέρυξ (ptérux, “wing”). By surface analysis, pteryg- +‎ -ium. === Noun === pterygium (plural pterygiums or pterygia) (pathology) An abnormal mass of tissue in the corner of the eye that obstructs vision. (zoology) A generalized limb of a vertebrate. ==== Derived terms ==== ==== Translations ==== ==== See also ==== pterygiate webeye