• synonyms


[tuh-rij-ee-uh m]
noun, plural pte·ryg·i·ums, pte·ryg·i·a [tuh-rij-ee-uh] /təˈrɪdʒ i ə/. Ophthalmology.
  1. an abnormal triangular mass of thickened conjunctiva extending over the cornea and interfering with vision.
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Origin of pterygium

1650–60; < New Latin < Greek pterýgion little wing or fin, equivalent to pteryg- (stem of ptéryx) wing, fin + -ion diminutive suffix
Related formspte·ryg·i·al, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for pterygium

Historical Examples of 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.

  • The base of the pterygium was then severed with the scalpel for the plastic operation on entropion.

  • Albucasis, who conveys entire the passage on pterygium from Paul, gives figures of both these instruments.

  • Tension being made on the thread by an assistant, the operator sawed off the pterygium towards the apex by means of the horsehair.

pterygium in Medicine


n. pl. pte•ryg•i•ums
  1. An abnormal mass of tissue arising from the conjunctiva of the inner corner of the eye that obstructs vision by growing over the cornea.
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Related formspte•rygi•al adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.