- an abnormal triangular mass of thickened conjunctiva extending over the cornea and interfering with vision.
Origin of pterygium
1650–60; < New Latin < Greek pterýgion little wing or fin, equivalent to pteryg- (stem of ptéryx) wing, fin + -ion diminutive suffix
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- zoology of or relating to a fin or wing
from Greek pterux wing
- An abnormal mass of tissue arising from the conjunctiva of the inner corner of the eye that obstructs vision by growing over the cornea.