- 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
Examples from the Web for pterygium
Pterygium: a lateral expansion of the snout of some Coleoptera.Explanation of Terms Used in Entomology
John. B. Smith
Pterygium should be removed when advancing across the cornea, especially when the pupillary area is becoming involved.
Tension being made on the thread by an assistant, the operator sawed off the pterygium towards the apex by means of the horsehair.
Albucasis, who conveys entire the passage on pterygium from Paul, gives figures of both these instruments.
The base of the pterygium was then severed with the scalpel for the plastic operation on entropion.
- An abnormal mass of tissue arising from the conjunctiva of the inner corner of the eye that obstructs vision by growing over the cornea.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.