WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
noun.
a circumscribed inflammatory and often suppurating lesion on the skin or an internal mucous surface resulting in necrosis of tissue
noun.
the process of ulcer formation; the process of becoming ulcerated
Word Usage
"-- The condition usually known as ulceration of the womb, is not what is commonly termed ulceration elsewhere, but would be more properly termed abrasion, or erosion."