Medicine, white spot on cornea of eye; leucoma; Botany, white rust.    From Wordnik.com.  [xml's Blinklist.com] Reference

"Paul was smaller than children of his age; on his right eye he had from his youth a large leucoma; the eyelids had generally a catarrhal affection, and were in a state of suppuration.    From Wordnik.com.  [The Mind of the Child, Part II The Development of the Intellect, International Education Series Edited By William T. Harris, Volume IX.] Reference

The next day he gave the following testimony: “I the undersigned, can certify on oath, that five years ago, I examined Mary Cote's eyes, and found that the small-pox had produced opacity of the cornea of both, or the disease called leucoma.    From Wordnik.com.  [The Life of the Venerable Mother Mary of the Incarnation]

"White scar on the cornea," "leucoma," and "operation.".    From Wordnik.com.  [Complete Project Gutenberg Georg Ebers Works] Reference