Main Entry: ero·sion

Pronunciation: \i-ˈrō-zhən\

Function: noun

1 a : the superficial destruction of a surface area of tissue (as mucous membrane) by inflammation, ulceration, or trauma <erosion of the uterine cervix> b : progressive loss of the hard substance of a tooth
2 : an instance or product of erosion <a circular erosion on the skin>